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17. Stars And The Solar System : Science class 8 th:English Medium NCERT Book Solutions
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17. Stars And The Solar System
Additional - Question:
Que: Which planet is the nearest to the sun?
Ans: Mercury.
Que: which planet of solar system is smallest.
Ans: mercury.
Que: Which planet is known as morning star?
Ans: Venus.
Que: Which planet is nearest to the earth?
Ans: Mars.
Que: On which planet of solar system life exist?
Ans: Earth.
Que: Which factors are responsible for the existence and continuation of life on the Earth.
Ans: these are followings
1. the right distance from the Sun.
2. it has the right temperature range.
3. the presence of water and suitable atmosphere.
4. A blanket of ozone.
Que: Why does the Earth look blue and green in appearance from sky?
Ans: From space, the Earth appears bluegreen due to the reflection of light from water and landmass on its surface.
Que: What is responsible for the change of seasons on the Earth?
Ans: The tilt is responsible for the change of seasons on the Earth. As the axis of rotation of the Earth is not perpendicular to the plane of its orbit.
Que: Which planet is known as red planet?
Ans: Mars.
Que: Why is Mars called red planet?
Ans: Mars appears slightly reddish and, therefore, it is also called the red planet.
Que: How many satelites does Mars have?
Ans: Mars has two small natural satellites.
Que: Name the largest planet of the solar system?
Ans: Jupiter.
Que: Why is the Saturn called a unique planet of the solar system.
Ans: It has a beautiful ring which rotate apposite to its rotation. This makes it a unique planet of the solar system.
Que: What are asteroids?
Ans: There is a large gap in between the orbits of Mars and Jupiter. This gap is occupied by a large number of small objects that revolve around the Sun. These are called asteroids.
Que: What are comets?
Ans: Comets are also members of our solar system. They revolve around the Sun in highly elliptical orbits. A Comet appears generally as a bright head with a long tail.
Que: What are meteors?
Ans: However we may see a bright streaks of light falling in the sky. These are commonly known as shooting stars, although they are not stars. They are called meteors.
Que: Define light year?
Ans: The distance covered by the light in one years is called light year.
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