The length of the Milky Way is .......... light years.

The angle of maximum elongation for Venus is $47^\circ$. The distance of Venus from the Sun in $AU$ is .......

Which of the following is the coldest planet?

$A$ group of bright and faint stars is called

Great Bear is a

Suppose the Sun was located at the position occupied by the nearest star,say,Alpha Centauri,$4$ light-years away. By what factor would the solar radiation received per second per unit area decrease?