The sun is expected to exhaust its hydrogen fuel in about 5 billion years. What will be its effect?
- A. The sun will then expand into a red giant and possibly swallow the outer planets
- B. The sun will then expand into a red giant and possibly swallow the inner as well as outer planets, including Earth
- C. The sun will then expand into a red giant and possibly swallow the inner planets, including Earth
- D. Sun will stay as it is
Explanation
After exhausting core hydrogen, the Sun is expected to expand into a red giant, probably engulfing or destroying the inner planets, including Earth. The distant outer planets are not expected to be swallowed.