Inner planets: Mercury, Venus, the Earth, Mars
Outer Planets: Jupiter, Saturn, Uranus, Neptune.

The axis of rotation of the Earth is not perpendicular to the path of its orbit, but it is slightly tilted. The tilt is responsible for the change of seasons on the earth.

Venus appears in the Eastern sky before sunrise. Sometimes it appears in Western sky just after sunlight. Therefore it is often called a morning or an evening star.

Any celestial body revolving around another celestial body is called its satellite. Moon is natural satellite of earth.

American astronaut, Neil Armstrong, landed on the moon for the first time in July 1969.

On the fifteenth day the moon is not visible. This day is known as the new moon day.

The planets revolve in different orbits around the Sun. So, they do not collide.

Halley's comet appears periodically after every 76 years. It was last seen in 1986. So, it will be visible again in the mid of 2061.

13 times, because the earth makes 1 revolution around the sun in 1 year.

No, Paheli will not be able to see the position of the moon at the same place because due to revolution of the moon around the earth continuously, the position of the moon will also change.

The periodic comet is Halley's comet, as it appears after regular interval of time (76 years).

No, the nearest star alpha Centauri is at a distance 40000000000000 km from the Earth. So, they can be expressed in light year.

Since, Pole star seems to be stationary, so it will be at one of the ends

No, as there is a need of a medium for the propagation of sound. On the moon, there is no such medium. Thus, we cannot hear the sound on the moon.