Multiple choice

Black dwarf stars have likely never been observed because:

  1. They are made of dark matter

  2. They are similar to black holes

  3. They would take longer to form than the universe has existed

  4. They all died out just after the big bang
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A black dwarf is the theoretical final stage of a white dwarf after it has cooled completely. Because the universe is only about 13.8 billion years old, there has not been enough time for any white dwarf to cool down to that state.

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