Which one of the following is a reason why astronomical distances are measured in light-years?

Consider the following statements about Light year: 1. Light year is a unit for measurement of very large distances. 2. Light year is a unit for measurement of very large time intervals. 3. Light yea…

Which one among the following stars is nearest to the earth?

Which one of the following astronomers proved that the Earth and other planets revolve around the Sun ?

Which one from among the following planets is largest in size?

Which one of the following planets has the highest density?