The flash spectrum confirms a/an:

Who was the first Indian astronaut to travel into space?

When the original mass of a star is greater than $5\, M$ ($M =$ mass of the sun),the death of this star will give rise to:

Hubble's law states that the velocity with which a galaxy is moving away from the Earth is proportional to:

$A$ particular emission line,detected in the light from a galaxy,has a wavelength $\lambda' = 1.1\lambda$,where $\lambda$ is the proper wavelength of the line. The distance of the galaxy from us is:

Which one of the following planets has the longest day?