Which of the following statements is/are correct?
1. All stars and planets in the universe shine by the reflected light of the sun.
2. Sun is believed to be formed of condensation of gases.
3. The sun has a surface temperature of about 20 million °C.
4. Sun is about 30,000 times as big as the earth.
Select the correct answer from the codes given below.
(a) 2 only (b) 1 and 2 (c) 3 and 4 (d) 2 and 3
