Maharashtra Board Class 7 Science Chapter 20 In the World of Stars Solutions

1. Write The Proper Words In The Blanks:

Question a. When seen from a great distance, the sky seems to be touching the ground along a circle. This circle is called the horizon.
Answer: horizon
In simple words: The boundary where the sky appears to meet the Earth, forming a circle, is known as the horizon.

🎯 Exam Tip: Understanding basic celestial definitions like the horizon is fundamental for astronomical concepts and often asked in fill-in-the-blank questions.

Question b. The meridian is used while defining the zodiac sign.
Answer: meridian
In simple words: The meridian is an imaginary line that passes through the celestial poles and the observer's zenith, used as a reference for celestial positions including zodiac signs.

🎯 Exam Tip: Correctly identifying astronomical reference lines like the meridian is crucial for precise sky observation and definition, often tested in objective questions.

Question c. Classified according to seasons, one season will have nine nakshatras.
Answer: nine
In simple words: When nakshatras are grouped by seasons, each season is traditionally associated with nine specific nakshatras.

🎯 Exam Tip: Knowing the number of nakshatras per season is a factual detail that can be a quick scoring point in quizzes or short-answer questions.

Question d. The rising of the sun in the east and its setting in the west is the apparent motion of the sun.
Answer: apparent
In simple words: The daily movement of the sun across the sky from east to west is not its actual movement, but rather an apparent motion caused by the Earth's rotation.

🎯 Exam Tip: Distinguishing between actual and apparent motion in astronomy is important for conceptual clarity and frequently appears in multiple-choice questions.

Question a. A star rises at 8 pm. tonight. At what time will it rise after a month? Why?
Answer:
1. Stars rise and set 4 minutes earlier every day. If a star rises at 8 pm tonight, it will rise at 7:56 pm tomorrow.
2. It will rise at 5:24 pm after a month.
3. The sun and the moon are seen to move from the west to the east against the background of stars.
4. The sun moves through one degree every day and the moon through 12 to 13 degrees.
5. This happens due to the motion of the earth around the sun and the moon around the earth which affects the duration of the stars and shortens its time period.
In simple words: Due to Earth's orbit, stars rise approximately 4 minutes earlier each day, meaning a star rising at 8 PM tonight will rise around 5:24 PM a month later, as the Earth's position relative to the stars changes.

🎯 Exam Tip: Questions involving the apparent motion and timing of star rises require an understanding of Earth's rotation and revolution. Showing the calculation process or explanation of time shift is key.

Question a. What is meant by "The sun enters a nakshatra?” It is said that in the rainy season the sun enters the mrug nakshatra. What does it mean?
Answer:
1. When we look at the sun we see not only the sun but also constellation behind the sun.
2. The constellation cannot be seen in bright sunlight but it is indeed present behind the sun.
3. As the earth changes its position, a different constellation or zodiac sign or raashi appears behind the sun.
4. This is what we express when we say that the sun enters a particular zodiac sign or raashi.
5. In rainy season due to the perceived motion of the sun, it enters mrug nakshatra and that is how it is expressed.
In simple words: "The sun enters a nakshatra" means that from Earth's perspective, the sun appears to be aligned with a specific constellation or zodiac sign because of Earth's orbital movement. This perceived alignment changes throughout the year, marking different seasons, like the sun entering Mrug Nakshatra during the rainy season.

🎯 Exam Tip: Clearly explaining the concept of apparent motion and celestial alignment is key. Emphasize that the sun doesn't physically move into a nakshatra, but our viewpoint from Earth changes.

Question a. What is a constellation?
Answer: A group of stars occupying a small portion of the celestial sphere is called a constellation.
In simple words: A constellation is simply a recognizable pattern or group of stars in the night sky.

🎯 Exam Tip: A precise definition of a constellation, mentioning "group of stars" and "celestial sphere," is expected. Avoid vague descriptions.

Question b. What points should be considered before a skywatch?
Answer:
1. The place for sky watching should be away from the city and as far as possible it should be new moon night.
2. Binoculars or telescopes should be used for skywatch.
3. Identifying the pole star in the north makes the skywatch easier. Hence the pole star should be used as a reference point for skywatch.
4. As the stars in the west set early, sky watching should begin with stars in the west.
5. (a) On a sky map, the north and south are towards the bottom and top of the map respectively, (b) This is because the sky map is to be held overhead in such a way that the direction we face is at the bottom side.
In simple words: For a successful skywatch, choose a dark location away from city lights, ideally during a new moon. Use binoculars or a telescope, find the Pole Star for orientation, and begin observing stars in the west, holding your sky map overhead correctly.

🎯 Exam Tip: List questions require comprehensive points. Make sure to cover location, equipment, orientation (Pole Star), and observation strategy for full marks.

Question c. It is wrong to say that the planets, stars and nakshatras affect human life. Why?
Answer:
1. Science has proved that the constituents of the solar system e.g. planets, satellites and comets as also distant stars and constellations do not have any influence on human life.
2. Man has stepped on the moon and will conquer Mars in the 21st century.
3. Hence, in this age of science, holding on to beliefs which have been proved wrong by numerous scientific tests, is an unnecessary waste of time and energy.
4. It is important to consider all these issues with a scientific frame of mind.
In simple words: Scientific evidence shows that celestial bodies like planets, stars, and nakshatras have no proven influence on human life. Believing otherwise goes against scientific understanding and wastes time and energy.

🎯 Exam Tip: When addressing scientific misconceptions, it's important to provide a clear, evidence-based argument, emphasizing scientific proof and rational thinking.

Question a. Write a paragraph on the birth and life cycle of stars using following figure.
Answer:
ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र तारों के जन्म और जीवन चक्र को दर्शाता है। यह एक निहारिका (नेबुला) से शुरू होता है, जहाँ गैस और धूल से तारे बनते हैं। इसके बाद दो मुख्य मार्ग दिखाए गए हैं: एक साधारण तारे का जीवन चक्र (जो लाल दानव और फिर श्वेत वामन बनता है) और दूसरा विशाल तारे का जीवन चक्र (जो लाल महादानव, सुपरनोवा, न्यूट्रॉन तारा और अंततः ब्लैक होल बन सकता है).
Stars are born out of nebulae. Nebulae are clouds made up mainly of hydrogen gas and dust particles which are attracted towards one another by the force of gravity. (i) As a result of pressure, the internal temperature increases and the cloud becomes dense and spherical in shape. (ii) From the diagram, the life cycle of two stars can be explained.
(a) Ordinary star: (i) The ordinary star forms a Red giant star at the later stage of its evolution when it runs out of hydrogen gas at its core. (ii) At the end stage of its life it forms a white dwarf. Stars like the sun become white dwarf when its nuclear fuel is totally exhausted. (iii) It is 1% in diameter of its original size.
(b) Massive Star: (i) Massive star forms Red super giant star at the end of its life cycle. (ii) They are also called super red giants with a relatively cool outer surface. (iii) Supernova is the explosive death of the star at the end of its life with the brightness of 100 million stars in a short amount of time. (iv) A neutron star is the dense core of the supernova. (v) It is the smallest and the densest star known to exist with a 10 km radius. (vi) Neutron stars sometimes end as a black hole. (vii) Black holes are not seen from telescopes and are identified by their intense gravitational pull where even light cannot escape.
In simple words: Stars begin as nebulae, which are gas and dust clouds that collapse due to gravity, forming dense, hot spheres. Their life cycle then splits: ordinary stars become red giants and finally white dwarfs, while massive stars evolve into red super giants, explode as supernovae, and may leave behind neutron stars or black holes.

🎯 Exam Tip: When describing the life cycle of stars, it's crucial to differentiate between ordinary and massive stars, detailing the distinct stages and end products for each. A clear, sequential explanation scores well.

Fill In The Blanks:

Question 1. The different group of stars is known as constellation.
Answer: constellation
In simple words: A constellation is a recognizable pattern formed by a group of stars in the night sky.

🎯 Exam Tip: This is a basic definition. Ensure the spelling of "constellation" is correct.

Question 2. The pole star is North star.
Answer: North star
In simple words: The Pole Star, also known as Polaris, is the star nearly aligned with the Earth's axis of rotation in the Northern Hemisphere.

🎯 Exam Tip: Knowing the alternative name for the pole star is essential for general knowledge and exam questions.

Question 3. The moon moves around the earth in about 27 days.
Answer: 27 days
In simple words: The Moon completes one full orbit around the Earth in approximately 27 days.

🎯 Exam Tip: Remember the approximate orbital period of the Moon around Earth, a common factual question.

Question 4. The celestial objects are The stars.
Answer: The stars
In simple words: Stars are the luminous celestial objects visible in the night sky.

🎯 Exam Tip: This is a broad term, but in the context of general celestial objects visible to the naked eye, "stars" is the expected answer.

Question 5. The star that lies close to the aris of rotation of the earth is Pole star.
Answer: Pole star
In simple words: The Pole Star is located near the celestial north pole, making it appear stationary as the Earth rotates.

🎯 Exam Tip: The Pole Star's unique position near Earth's axis of rotation makes it a crucial reference point for navigation and sky observation.

Question 6. The definite elliptical path in which a planet revolves around the sun is called Orbit.
Answer: Orbit
In simple words: A planet travels in a fixed, oval-shaped path called an orbit as it moves around the sun.

🎯 Exam Tip: The term "orbit" is fundamental in astronomy; ensure you define it precisely, mentioning "elliptical path" and "revolves."

Question 7. Our earth as well as the sun belongs to the galaxy which has a spiral shape called milky way.
Answer: milky way
In simple words: Our solar system, including Earth and the Sun, is part of a large spiral-shaped galaxy known as the Milky Way.

🎯 Exam Tip: Knowing the name and shape of our home galaxy is a basic but important piece of astronomical knowledge.

Question 8. Sharmishtha is made up of five bright stars which are distributed along the figure of the letter M.
Answer: Sharmishtha
In simple words: The constellation Sharmishtha, also known as Cassiopeia, is recognized by its distinctive "M" or "W" shape formed by five bright stars.

🎯 Exam Tip: Identifying constellations by their star patterns is a common question. Associate the "M" shape with Sharmishtha (Cassiopeia).

Question 9. The pole star has Saptarashi on one-side and Sharmishtha on the other.
Answer: Saptarashi, Sharmishtha
In simple words: The Pole Star is flanked by two prominent constellations, Saptarshi (Ursa Major) on one side and Sharmishtha (Cassiopeia) on the other.

🎯 Exam Tip: This question tests knowledge of how to locate the Pole Star using neighboring constellations, a practical skill for skywatchers.

Question 10. The continuous empty space between the planets and stars in the sky is called space.
Answer: space
In simple words: The vast, continuous void that exists between celestial bodies like planets and stars is known as space.

🎯 Exam Tip: This is a simple definition. Ensure the term "space" is used correctly in an astronomical context.

Name The Following:

Question 1. The brightest star in the nakshatra.
Answer: Yogatara
In simple words: Within any given nakshatra, the brightest star present is identified as the Yogatara.

🎯 Exam Tip: Remember "Yogatara" as the specific term for the brightest star within a nakshatra, as this is a precise definition.

Question 2. The stars forming a group that has a recognizable shape.
Answer: Constellation
In simple words: A group of stars that appears to form a distinct pattern or figure in the night sky is called a constellation.

🎯 Exam Tip: This is another way to define a constellation. Focus on the "recognizable shape" aspect for this specific question.

Question 3. Millions of stars and planets present in the sky forming a group.
Answer: Milky way
In simple words: The vast collection of millions of stars, planets, and other celestial bodies that our solar system belongs to is known as the Milky Way galaxy.

🎯 Exam Tip: Understand that the "Milky Way" refers to our entire galaxy, containing millions of stars, not just a single constellation.

Question 4. The clouds from which stars are bom.
Answer: Nebulae
In simple words: Stars are formed from nebulae, which are giant clouds of gas and dust in space.

🎯 Exam Tip: "Nebulae" is the correct term for stellar nurseries, which is important for understanding star formation.

Question 5. Saptarshi constellation in English.
Answer: Great Bear
In simple words: The Saptarshi constellation is commonly known as the Great Bear or Ursa Major in English.

🎯 Exam Tip: Know the English names for popular constellations like Saptarshi, as both names are often used interchangeably.

Question 6. The festival celebrated when sun enters Makar raashi.
Answer: Makara Sankranti
In simple words: Makara Sankranti is a Hindu festival celebrating the sun's transition into the zodiac sign of Makara (Capricorn).

🎯 Exam Tip: This question connects astronomy with cultural practices. Remember the specific festival associated with the sun's entry into Makar Rashi.

Question 7. The brightest star in the Orion constellation.
Answer: Sirius
In simple words: Sirius is the most luminous star visible in the night sky, often located by following the belt stars of the Orion constellation.

🎯 Exam Tip: Sirius is known for its extreme brightness. Remember its association with the Orion constellation.

State Whether The Following Statements Are True Or False. Correct The False Statements:

Question 1. The hydrogen gas and dust particles in a nebulae are attracted towards each other by gravity.
Answer: True
In simple words: In a nebula, the force of gravity pulls hydrogen gas and dust together, which is the initial step in star formation.

🎯 Exam Tip: This statement describes the fundamental process of gravitational collapse in star formation. Knowing this basic principle is crucial.

Question 2. While standing on the ground, the celestial sphere exactly below our feet is called the Zenith.
Answer: False. The point on the celestial sphere exactly above our head is called the Zenith.
In simple words: The Zenith is the point directly above an observer's head on the celestial sphere, not below their feet.

🎯 Exam Tip: Distinguish between Zenith (directly overhead) and Nadir (directly underfoot). Precise definitions are important for astronomy questions.

Question 3. The circle describing the apparent motion of the earth around the sun is called the ecliptic.
Answer: False. Ecliptic is the apparent motion of sun around the earth.
In simple words: The ecliptic is the apparent path of the Sun across the celestial sphere over the course of a year, which is a reflection of Earth's actual orbit around the Sun.

🎯 Exam Tip: Clarify that the ecliptic is the apparent path of the *sun* as seen from Earth, not the apparent motion of the Earth around the sun directly. This subtle distinction is important.

Question 4. Vrushchik or Scorpio is a constellation with 10 to 12 stars.
Answer: True
In simple words: The constellation Scorpio, also known as Vrushchik, is indeed composed of 10 to 12 visible stars.

🎯 Exam Tip: Factual details about specific constellations, like the number of stars, can be tested. Remember the association between Vrushchik and Scorpio.

Question 5. Makar raashi is also known as Capricorn zodiac sign.
Answer: True
In simple words: The Makar raashi in Indian astrology corresponds to the Capricorn zodiac sign in Western astrology.

🎯 Exam Tip: This question connects Indian astronomical terms with their Western equivalents. Knowing common correspondences is useful.

Match The Following:

Question a.

Answer:

In simple words: This matching exercise connects various celestial objects or terms with their defining characteristics, such as Saptarshi being a group of 7 stars, the Pole Star indicating north, and the celestial sphere containing 88 constellations.

🎯 Exam Tip: For 'Match the following' questions, understand each term's definition. Verify associations carefully, especially for constellations and their descriptions, as partial knowledge can lead to errors.

Answer In One Line:

Question 1. In which direction stars move in the sky except polar star?
Answer: When seen from earth, stars appear to move from east to west.
In simple words: Due to Earth's rotation, all stars except the Pole Star seem to move across the sky from east to west.

🎯 Exam Tip: Remember the apparent eastward-to-westward motion of stars, which is a direct consequence of Earth's rotation from west to east.

Question 2. What activity does IUCAA carry out?
Answer: IUCAA which is present in PUNE carries out fundamental research in astronomy.
In simple words: IUCAA, located in Pune, conducts important basic research in the field of astronomy.

🎯 Exam Tip: Know key organizations and their functions related to the subject. IUCAA is a prominent Indian institution for astronomy research.

Question 3. Define constellation.
Answer: A group of stars occupying a small portion of the celestial sphere is called constellation.
In simple words: A constellation is a specific grouping of stars that forms a recognizable pattern within a defined area of the night sky.

🎯 Exam Tip: A precise definition is crucial here. Include both "group of stars" and "celestial sphere" for a complete answer.

Question 4. What is Nakshatra?
Answer: The moon completes one revolution around the earth in approximately 27 days. The portion celestial sphere traversed by the moon in one day is called a nakshatra.
In simple words: A nakshatra is a segment of the celestial sphere that the Moon appears to traverse in approximately one day during its 27-day orbit around Earth.

🎯 Exam Tip: When defining nakshatra, link it to the Moon's orbit and its daily apparent movement across the celestial sphere.

Question 5. What is yogatara?
Answer: A nakshatra is known from the brightest star that it contains. The brightest star is called the yogatara.
In simple words: The yogatara is the most luminous star found within a particular nakshatra, used to identify it.

🎯 Exam Tip: Accurately defining 'yogatara' as the brightest star within a nakshatra demonstrates precise understanding of astronomical terminology.

Define The Following:

Question 1. Horizon
Answer: Far away the sky seems to be touching the ground. The line at which they meet is caled horizon.
In simple words: The horizon is the apparent line where the Earth's surface and the sky appear to meet in the distance.

🎯 Exam Tip: Define the horizon clearly as the visible boundary between the sky and the Earth's surface, ensuring no common misconceptions.

Question 2. Zenith
Answer: While standing on the ground the point on the celestial sphere exactly above our head is called the Zenith.
In simple words: The Zenith is the point on the celestial sphere directly above an observer's head.

🎯 Exam Tip: Provide a precise definition of Zenith, emphasizing it's the point *directly above* the observer on the celestial sphere.

Question 3. Nadir
Answer: While standing on the ground the point on the celestial sphere exactly below our feet is called the nadir.
In simple words: The Nadir is the point on the celestial sphere located directly below an observer's feet.

🎯 Exam Tip: Differentiate Nadir from Zenith by specifying it's the point *directly below* the observer on the celestial sphere.

Question 4. Meridian
Answer: The great circle which passes through both the celestial poles and the observer's zenith and nadir is called a meridian.
In simple words: A meridian is an imaginary great circle on the celestial sphere that connects the celestial poles, passing through the observer's zenith and nadir.

🎯 Exam Tip: A comprehensive definition of the meridian should include its passage through celestial poles, zenith, and nadir, highlighting its role as a great circle.

Question 5. Celestial equator
Answer: If we uniformly expand earth's equator in all directions indefinitely, it will penetrate the celestial sphere along a circle. This circle is known as the celestial equator.
In simple words: The celestial equator is an imaginary great circle on the celestial sphere, formed by extending Earth's equator outwards into space.

🎯 Exam Tip: Define the celestial equator by relating it directly to the Earth's equator and its projection onto the celestial sphere.

Question 6. Ecliptic
Answer: The earth moves around the sun, but seen from the earth, the sun appears to move along a circle on the celestial sphere. This circle describing the apparent motion of the sun around the ' earth is called the ecliptic.
In simple words: The ecliptic is the apparent path that the Sun traces across the celestial sphere over a year, caused by Earth's orbit around the Sun.

🎯 Exam Tip: Emphasize that the ecliptic is the *apparent* path of the Sun as viewed from Earth, a crucial distinction in astronomy.

Question 7. Zodiac sign
Answer: The ecliptic has been imagined to divided into 12 equal parts. Each part subtends 30 degrees at the centre of the celestial sphere. Each of these part is called a raashi or zodiac sign.
In simple words: Zodiac signs are 12 equal divisions, each spanning 30 degrees, along the ecliptic, used to mark the apparent path of the Sun, Moon, and planets.

🎯 Exam Tip: Clearly state that zodiac signs are 12 divisions of the ecliptic, each 30 degrees, and mention their alternative name 'raashi'.

Question 8. Mrug Nakshatra or Orion
Answer: It has 7-8 starts of which four are at the comers of quadrangle. The line passing through the three middle stars of the constellation when extended meets a very bright star. This is Vyadh or Sirius.
In simple words: Mrug Nakshatra, also known as Orion, is a prominent constellation with 7-8 bright stars, identifiable by its quadrilateral shape and three central belt stars pointing towards Sirius.

🎯 Exam Tip: When describing constellations like Orion, include key features like the number of main stars, prominent shapes, and how to use them to locate other significant stars (like Sirius).

Answer The Following Questions

Question 1. Using a Marathi calendar collect information about 27 nakshatras, and divide them into the following 3 categories.
(i) Monsoon Nakshatra
(ii) Winter Nakshatra
(iii) Summer Nakshatra
Answer:
27 nakshtras: Ashwini, Bharani, Krittika, Rohini, Mrigashirasha, Ardra, Punarvasu, Pushya, Ashlesha, Magha, PurvaPhalguni, Uttara Phalguni, Hasta, Chitra, Swati, Vishakha, Anuradha, Jyeshtha, Mula, Purva Ashadha, Uttara Ashadha, Abhijit, Shravana, Dhanishtha, Shatabhishta, Purva Bhadrapada, Uttara Bhadrapada, Revati

In simple words: The 27 nakshatras are celestial divisions used in Indian astronomy, each associated with different seasons. They are categorized into Monsoon, Winter, and Summer seasons based on when the Sun appears in that specific nakshatra.

🎯 Exam Tip: When categorizing nakshatras by season, pay close attention to the traditional groupings. Presenting this information clearly, perhaps in a table format, can help secure full marks.

Question 2. Write the difference between constellations Saptarshi and Mrug nakshatra
Answer:

In simple words: Saptarshi (Great Bear) is known for its M-shaped structure with Pole Star as its brightest, visible in spring/autumn, while Mrug Nakshatra (Orion) features a quadrangle of 7-8 stars and contains Sirius, visible in winter.

🎯 Exam Tip: When differentiating constellations, focus on distinct features like star count, shape, brightest stars, and seasons of visibility. Using a table format helps in clear comparison.

Question 3. Draw sketches to show the relative position of prominent stars in Ursa major and Orion.
Answer:
a. Ursa major (Saptarshi) appears like a big dipper, (or kite shape). There are 3 bright stars in the handle and 4 stars in the bowl of the dipper. (It can be seen during April in summer in northern skies).
ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र सप्तर्षि (उर्सा मेजर) और ध्रुव तारे की सापेक्ष स्थिति को दर्शाता है। सप्तर्षि एक बड़े करछुल या पतंग के आकार जैसा दिखता है, जिसमें चार तारे कटोरे का निर्माण करते हैं और तीन तारे हैंडल बनाते हैं। ध्रुव तारा सप्तर्षि के 'कटोरे' के दो अंतिम तारों को जोड़कर बनाई गई एक सीधी रेखा के विस्तार पर स्थित है, जो उत्तरी दिशा को इंगित करता है।
In simple words: Ursa Major, also known as Saptarshi, looks like a large dipper or kite, with seven prominent stars forming its handle and bowl, used to locate the North Star.

🎯 Exam Tip: When describing constellations, vividly explain their shape and how they can be used as sky markers. For diagrams, a clear, concise description is essential to convey the visual information.

Question 4. Why is the pole star important for sky watch?
Answer: 1. Identifying the Pole Star in the north makes the sky watch easier. Hence the pole star should be used as a reference point for skywatch.
2. If we extend one side of the quadrangle of Saptarshi, it reaches the Pole Star. The pole star has Saptarshi on one side and Sharmishtha on the other.
In simple words: The Pole Star is crucial for sky watching because its fixed position in the north serves as a reliable reference point, simplifying navigation and star identification. It can be easily located by extending a line from the Saptarshi constellation.

🎯 Exam Tip: Understanding the Pole Star's role as a fixed reference point is key for astronomy questions; students should also know its relation to major constellations like Saptarshi for full marks.

Question 5. What is the relation between the pole star and the constellations Saptarshi and Sharmishtha?
Answer: 1. Saptarshi is in the shape of a quandrangle with a tail made up 3 stars resembling a kite. If we extend one side of the quadrangle it reaches the Pole Star.
2. The constellations of Saptarshi and Sharmishtha are useful in locating the Pole Star.
3. The perpendicular bisector of the line joining the third and fourth stars in Sharmishtha goes towards the Pole star.
4. The Pole Star has Saptarshi on one side and Sharmishtha on the other.
ℹ️ चित्र व्याख्या (Diagram Explanation): यह चित्र रात के आकाश में ध्रुव तारे और शर्मिष्ठा या कैसिओपिया तारामंडल को दर्शाता है। ध्रुव तारा सबसे ऊपर है, और शर्मिष्ठा तारामंडल (जो 'W' या 'M' जैसा दिखता है) उसके नीचे स्थित है। चित्र में एक बिंदीदार रेखा दिखाई गई है जो दर्शाती है कि शर्मिष्ठा तारामंडल का उपयोग ध्रुव तारे का पता लगाने के लिए कैसे किया जा सकता है।
In simple words: The Pole Star can be located by extending one side of the Saptarshi (Ursa Major) constellation's quadrangle. Both Saptarshi and Sharmishtha (Cassiopeia) constellations are positioned around the Pole Star, making them useful guides for finding it in the night sky.

🎯 Exam Tip: Describing the specific shapes and relative positions of Saptarshi and Sharmishtha with respect to the Pole Star demonstrates a strong grasp of celestial navigation concepts.

Use Your Brain Power!

Answer The Following Questions.

Question 1. One Zodiac Sign = ............ nakshatras
Answer: 27 nakshatras. Each nakshatra is divided in padas or charan. Every nakshatra has 4 padas. These 27 nakshatra complete the entire circle of 360° of zodiac. The zodiac comprises of 360°.
In simple words: While a zodiac sign is usually a 30-degree segment of the zodiac, the question implies a broader relationship with nakshatras. There are 27 nakshatras that collectively cover the entire 360-degree zodiac, with each nakshatra being further divided into four 'padas'.

🎯 Exam Tip: It's important to differentiate between zodiac signs (raashis) and nakshatras; knowing the total number of nakshatras and their division is crucial for astronomical understanding.

Question 2. Is sun the only star present in our Milky Way galaxy?
Answer: No. Sun is not the only star present in the Milky Way. There are lakhs of stars in the Milky Way, some of them being many times bigger than our sun. Some of them have their own planetary systems with a great diversity in colour, brightness, as well as size.
In simple words: No, the Sun is not the only star in the Milky Way galaxy; it is just one of hundreds of billions of stars, many of which are much larger and brighter, and some even host their own planetary systems.

🎯 Exam Tip: Emphasizing the vastness of the Milky Way and the diversity of its stars, beyond just our Sun, showcases a comprehensive understanding of stellar astronomy.