A study of binary stars is most helpful in

A group of bright and faint stars is called

According to modern astronomers into how many constellations, the whole sky is divided

Which of the following theories is the most satisfactory about the origin of the universe

Which of the planet is brightest

A star which appears blue will be

Hubble showed that the universe as a whole is expanding and the distant stars are receding from us. The spectral line from a star, when compared with the corresponding line from a source will then show

$C{O}_{2}CO\_2$ gas is found in which of the following pairs of the planet

Black hole is a

The age of universe is believed to be