Light Year

Q. What is the definition of light year?

1. The speed at which light travels for one earth year in space.
2. The time taken by the light to reach Earth from the Sun.
3. The distance which light travels in one earth year in space.
4. The distance which Earth travels in one earth year in space.

Q. The closest star to earth after the sun is .

1. Proxima Centauri
2. Pole Star
3. Sirius A

Q. Is sun the only star present in our Milky Way galaxy?

Q. The Milky Way is the largest galaxy in the Universe.

1. True
2. False

Q. 1 Light year = $9.46\times {10}^{12}km$

1. True
2. False

Q. are celestial bodies that emit light of their own

1. Planets
2. Stars
3. Asteroids

Q. The Milky Way is the largest galaxy in the Universe.

1. True
2. False

Q. What is one light year?