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The Star Now Called Kepler-444 Is 11 Billion Years Old

Question 26

Multiple Choice

The star now called Kepler-444 is 11 billion years old (much older than the Sun) and has five planets orbiting close to it. What has this system taught astronomers about the history of star formation?


A) All old stars must have their planets orbiting very close to them; only much younger stars have planets far away (like our Jupiter)
B) If such an old star has planets close to it, where it's really warm, those planets must be made of heavier elements. So heavier elements must have formed before the time this star formed.
C) If planets formed so long ago, then by today all the heavy elements must be exhausted; this means rocky planets can no longer form in the Galaxy
D) Stars like Kepler-444 are old and exceptional. Today, stars have much more trouble forming more than one planet, and certainly never form five at a time.
E) Kepler-444 must have collided with another star and "stolen" its planets; no star could possibly have had planets this early in the history of the Galaxy

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