Beyond Earth (Question & Answers)

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 Book Work


A. Choose the correct answer.
1. (c)
2. (a)
3. (a)
4. (b)
5. (d)
6. (b)
7. (a)
8. (c)

B. Fill in the blanks.
1. galaxy
2. star, satellite
3. Venus
4. Neptune
5. meteors

C. State True or False. Also correct the false statements.
1. True
2. True
3. False, Jupiter is the biggest planet of the solar system.
4. True
5. True

Notebook Work 

D. Tick (√) the odd-one out giving reason.

1. Alpha centauri, others are constellations.
2. Elliptical galaxy, milky way is a spiral galaxy.
3. Saturn, others are terrestrial (or inner) planets.
4. Star, others are part of solar system.
5. Pluto, others are planets.

Short Answer: (This is not as per book questions, but you need to write all in the notebook at the place of Short and Long Answers)

Q. Does the Moon receive more sunlight on a full Moon night?
A. No, the Moon does not receive more sunlight on a full Moon night.

Q. On what does the amount of sunlight received by the Moon depend?
A. The amount of sunlight received by the Moon depends on its position relative to the Sun.

Q. Does the Earth affect how much sunlight the Moon receives?
A. No, the Earth does not affect how much sunlight the Moon receives.

Q. What is a comet?
A. A comet is a heavenly body made of ice, dust, and small rocky particles. It revolves around the Sun in a long, oval-shaped path.

Q. What happens when a comet comes close to the Sun?
A. When a comet comes close to the Sun, the heat melts its ice. The melted ice turns into gas and mixes with dust to form a long tail.

Q. Why does a comet have a tail?
A. A comet has a tail because the Sun’s heat melts the ice, and the gas and dust spread out behind it.

Q. Why does the tail of a comet always point away from the Sun?
A. The Sun sends out strong winds called solar winds. These winds push the gas and dust away from the Sun, so the tail always points away from the Sun.

Q. What is the Pole Star also called?
A. The Pole Star is also called Dhruv Tara.

Q. Why does the Pole Star appear stationary in the sky?
A. The Pole Star appears stationary because it is almost exactly aligned with the Earth’s axis of rotation.

Q. What happens to other stars as the Earth rotates?
A. As the Earth rotates, other stars appear to move across the sky, while the Pole Star seems to stay in the same place.

Q. Why do stars appear small in the sky?
A. Stars appear small because they are very far away from the Earth.

Q. What are artificial satellites used for?
A. Artificial satellites are used for:

  • Communication
  • Weather forecasting
  • GPS (Global Positioning System)

Q. Why are Mercury, Venus, Earth, and Mars called terrestrial planets?

A. Mercury, Venus, Earth, and Mars are called terrestrial planets because they have a hard, rocky surface like the Earth. They are the four innermost planets in the solar system.

Q. Where is the full Moon seen in the evening sky?
A. The full Moon is seen in the eastern part of the sky in the evening.

Q. Where is the crescent Moon seen in the evening sky?
A. The crescent Moon is seen in the western part of the sky in the evening.

Q. Why do we always see the same side of the Moon from the Earth?
A. We always see the same side of the Moon because the time it takes to rotate on its axis is equal to the time it takes to revolve around the Earth. So, the same side of the Moon always faces the Earth.


B—(indicates the position of the Sun.)

III. HIGHER ORDER THINKING SKILLS

1. Every planet is at a different distance from the Sun and has a fixed orbit in which it revolves around the Sun. The Sun’s gravitational force holds the planets in their places, and they do not collide with each other because their orbits do not intersect.

2. No, it is not correct to classify the Moon as a planet. The Moon is classified as a natural satellite, not a planet. A planet is a celestial body that orbits a star (like the Sun) and has cleared its orbital path of other debris. The Moon, however, orbits the Earth, which is a planet, and not the Sun directly. This relationship places it in the category of natural satellites rather than planets.

3. If a star is 100 light-years away from the Earth, the explosion will be visible to people on Earth after 100 years. The distance that light travels in one year is known as one light-year.

4. The Moon shines because it reflects light from the Sun, even though it doesn’t produce its own light.

5. B & C

6. It is a comet revolving around the Sun.

A very popular celestial body name is Halley’s comet

The tail of a comet always points away from the Sun and it becomes longer as the comet comes closer to the Sun.



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