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Q17: Why is Mars so much colder than
Q18: How do disk stars orbit the center
Q21: Red and orange stars are found evenly
Q38: A spinning neutron star has been observed
Q71: Supermassive Black Holes: A Scientific Theory? Summarize
Q91: What do we mean when we say
Q93: Which one is used by a main-sequence
Q104: Spiral arms appear bright because _.<br>A) they
Q109: Briefly explain why stars that formed early
Q178: Why is Mars red?<br>A) Chemical reactions between