The Universe
EXERCISES
1. Answer the following questions briefly.
(a) How does a planet differ from a star?
(b) What is meant by the 'Solar System"?
(c) Name all the planets according to their distance from the sun.
(d) Why is the Earth called a unique planet?
(e) Why do we see only one side of the moon always?
(1) What is the Universe ?
. Tick the correct answer.
(a) The planet known as the "Earth's Twin" is
(i) Jupiter
(ii) Saturn
(iii) Venus
Answers
Answer:
a) The main difference between stars and planets is that stars have high temperatures compared to planets. Stars undergo nuclear reactions—they burn hydrogen in their cores, releasing massive amounts of energy.
b) The collection of eight planets and their moons in orbit round the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.
c) In order of distance from the sun they are; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Pluto, which until recently was considered to be the farthest planet, is now classified as a dwarf planet.
d) Earth is the only planet in our solar system that has a large amount of liquid water. About 74% of the surface of Earth is covered by liquid or frozen water. Because of this, people sometimes call it the blue planet. Because of its water, Earth is home to millions of species of plants and animals.
e) Only one side of the Moon is visible from Earth because the Moon rotates on its axis at the same rate that the Moon orbits the Earth – a situation known as synchronous rotation, or tidal locking. The Moon is directly illuminated by the Sun, and the cyclically varying viewing conditions cause the lunar phases.
1) I DON'T KNOW
a) no 3 Venus
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Answer:
a) The main difference between stars and planets is that stars have high temperatures compared to planets. Stars undergo nuclear reactions—they burn hydrogen in their cores, releasing massive amounts of energy.
b) The collection of eight planets and their moons in orbit round the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.
c) In order of distance from the sun they are; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Pluto, which until recently was considered to be the farthest planet, is now classified as a dwarf planet.
d) Earth is the only planet in our solar system that has a large amount of liquid water. About 74% of the surface of Earth is covered by liquid or frozen water. Because of this, people sometimes call it the blue planet. Because of its water, Earth is home to millions of species of plants and animals.
e) Only one side of the Moon is visible from Earth because the Moon rotates on its axis at the same rate that the Moon orbits the Earth – a situation known as synchronous rotation, or tidal locking. The Moon is directly illuminated by the Sun, and the cyclically varying viewing conditions cause the lunar phases.
1) The universe is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy.
a) no 3 Venus
Explanation: