The moment the meteors enter the Earth's atmosphere, then due to the friction of air, they get heated up and become visible. Then, they are seen as a bright streak of light flashing for a moment across the sky, so they usually get burnt out completely before reaching the surface of the Earth.

(i) Comets : Comets are also members of our solar system. Comets are celestial bodies that revolve around the sun in highly elliptical orbits. However, their period of revolution round the sun is usually very large. A comet appears generally as bright head with a long tail. The length of the tail of the comet grows in size as it approaches the sun. The tail of a comet is always directed away from the sun.
(ii) Meteors : At night, when the sky is clear and the moon is not there, you may sometimes see bright streaks of light in the sky. These are commonly known as shooting stars, although they are not stars. They are called meteors. A meteor is usually a small heavenly object moving around  the sun. Occasionally, a meteor enters the earth's atmosphere. At that time it has a very high speed. The friction due to atmosphere heats up meteor. It glows and evaporates in a very short time. That is why the bright streak appears for a very short time.
(iii) Meteorites: Some meteors are so large that a part of them reaches the surface of earth before they evaporate completely. These are called meteorites. Meteorites help scientists in investigating the nature of the material from which solar system was formed.

Different phases of moon are visible from the Earth. This change in shapes occurs due to variation in sunlight reflected by moon from its surface. At certain times, it appears to be bright whereas at others it appears to be dark. When brightness of moon is increasing, it is called waxing, when brightness of moon is decreasing, it is called vanning.

The plane of the equator is called the equatorial plane. The plane in which the Earth revolves round the sun is called the orbital plane of the Earth. These two planes are inclined to each other at an angle of 23.5°. This means that the axis of the Earth is inclined to its orbital plane at an angle of 66.5°.

Ursa Major: We can see it during summer time in the early part of the night. It is also known as Big Dipper, the Great Bear or the Saptarishi. There are seven prominent stars in this. It appears like a big dipper or a question mark. Three stars are in the handle of the ladle and four in its bowl.
Orion: It is seen during winters in late evening. It has seven or eight bright stars. It is also called hunter. Three middle stars represent the belt of the hunter. The four bright stars appear to be arranged in the form of a quadrilateral

The day on which the whole disc of the moon is visible is known as full moon day. Thereafter, every night the size of the bright part of the moon becomes thinner and thinner. On the fifteenth day the moon is not visible, which is known as new moon day. The next day, only a small portion of the moon appears in the sky, known as crescent and then again the moon grows larger every day. On 15th day again we get full view of the moon. These various shapes are called phases. We see different phases of moon as a result of difference in sunlight reflected by moon. Difference in sunlight incident on moon's surface arises due to revolution of moon around the earth.

Yes, stars twinkle whereas planets do not. Also the planets keep changing their position with respect to the stars.

As the earth rotates from West to East direction, so the stars appear to move from East to West direction as seen from the earth.

As earth completes one revolution around the sun in one year, so boojho has gone 13 times round the sun.

Generally, we use the term satellite for the bodies revolving around a planet. Moon is a natural satellite of the earth. So, Earth can be said to be a satellite of Sun.

Difference between a star and a shooting star are

Moon reflects the light of the Sun falling on it, thus that part of moon only appears bright which is towards us. The moon along with the Earth revolving around the Sun. As a result, the relative position of the moon continuously changing everyday.

The moment, the meteors enter the Earth's atmosphere, then due to the friction of air, they get heated up and become visible. Then, they seen as a bright streak of light flashing for a moment across the sky, so they usually burnt out completely before reaching the surface of the Earth.

As we know that the Earth rotates from west to east direction due to which the stars appear to move from east to west direction as seen from the Earth.

As we know that the only planet which is nearest to the Sun is Mercury, due to which temperature on it is very high. So, the existence of life on it is impossible. Besides this, this planet has no sign of water on its surface and the gases like carbon dioxide, hydrogen, oxygen and nitrogen do not exist in its atmosphere.