How does the red shift confirm that the universe is expanding

Two stars P and Q are observed at night. Star P appears reddish while, star Q is white. From this we conclude

Albedo is maximum for

When original mass of star is greater than 5 M (M = mass of the sun). The death of this star will give rise to

The tail of the comet is due to

In our solar system, there is one sun and

Which one of the following planet has the longest day

Which one of the following is known as Saptarishi

Smaller pieces of heavy stones and metals which on entering earth's atmosphere burns out are

In determining the temperature of a distant star, one makes use of