(i) The Sun provides a pulling force that binds the Solar System. It is the ultimate source of heat and light for the Solar System.
(ii) The dwarf planet of Solar System is Pluto

The majority of meteor showers are a result of debris left behind by comets, although some are caused by the debris of asteroids. Asteroids are mostly found in the asteroid belt between the orbits of Mars and Jupiter. Comets are primarily found beyond the orbit of Neptune in the Kuiper belt. When the Earth annually crosses the orbits of one of these small objects, the debris rains into the atmosphere, causing yearly meteor shower.

Gravity is force of attraction between objects with masses. When an object that is not supported by anything falls due to the force of gravity of another object, it is said to be in free fall. For example, the Moon falling towards the Earth. However, it also has an orbital speed from the momentum gained during its formation and follows the same curve as the Earth's surface. As these paths are parallel, the Moon perpetually falls on the Earth without even touching it.

Stars have their own light. They are big in size and are made up of extremely hot balls of fire and gases. Because of the huge flames, they tend to give huge flashes, and as the result of which the stars twinkle. On the other hand planets do not have their own light. They just, reflect the light received by them from the Sun. Hence, they do not twinkle.

Meteors, commonly known as shooting stars are bright stars that dart across the night sky. These trails of light are seen in the night sky. These trails of light are caused by pieces of interplanetary debris crashing into the Earth's atmosphere. They are actually all stars.

In a meeting of the International Astronomical Union, a decision was taken that Pluto like other celestial objects (Ceres, 2003 UB₃₁₃) discovered in recent past may be called 'dwarf planets'.

The Universe consists of celestial bodies like the stars, planets, galaxy, dust, and gases. The Universe is a large space that contains everything, i.e., all matter and energy from the smallest particles to the largest particles, whatever in the space is Universe. No one knows the size of the Universe. The astronomers believe that the Universe is still growing outwards in every direction.

Comet:
(i) It is a luminous heavenly body with a glowing tail.
(ii) Comets probably consist of ice, dust and frozen gases.
Asteroid:
(i) It is a small rocky and metallic object found between the orbit of Mars and Jupiter.
(ii) Asteroids are pieces of some planet, which probably exploded soon after its birth.

The temperature of a planet depends on the distance from the Sun. Mercury is very close to the Sun and hence, it is the very hottest planet in the solar system. Its temperature goes above 400^oC.

The sun is huge and made-up of extremely hot gases. It is at the centre of solar system. It provides the pulling force that binds the entire solar system. Apart from this, the sun is the ultimate source of heat and light for the solar system. These are the reasons which make the sun the head of the solar family.

An artificial or man-made satellite is made for the purpose to gather information about outer space and Earth's atmosphere. Some satellites are made for communication purpose and to predict weather also. It makes artificial satellites important to us.

The stars cannot be seen during day time because of the very bright sunlight. The powerful light of the sun makes moon and stars invisible during day time.

The rings that appear around some planets are belts of small debris. These rings can be seen from the Earth through powerful telescope. The planets with these rings are Uranus, Jupiter and Saturn.