Who was the first Indian astronaut to travel into space?

In our solar system,there is one sun and

Meteors are

$A$ 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:

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

The age of the universe is believed to be