Albedo is maximum for

Asteroids are

The hottest type of stars are called

What were the thoughts of the ancient Indian sage and scientist Aryabhatta regarding planetary motion?

$A$ bright star is indicated to have a brightness magnitude of $-5$ compared to a star of brightness zero magnitude. It means that this star,compared to the reference star of zero brightness,is:

Two stars situated at distances of $1$ and $10$ light years respectively from the earth appear to possess the same brightness. The ratio of their real brightness is