Fill in the blanks.
i. The ………….. and ………….. of variable stars is not stable.
ii. When a star contracts, its surface temperature ………….. and the star emits ………….. energy and appears ………….. .
iii. The sun which is at the centre of the solar system is a ………….. coloured star.
iv. The diameter of the sun is approximately ………….. km.
v. ………….. is the fastest moving planet.
