Towards the centre of sun

Period of revolution increases in the order of

The length of Milky way is

Which of the nine planets is the nearest to sun

Fraunhofer lines of the solar system is an example of

Hubble's law is related with

'Albedo' is

According to the pulsating theory the expansion and contraction of the universe repeats after every

Meteors are

Which of the following helps us in the determination of the temperature of sun