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Q2: After the Big Bang,as the universe cooled
Q4: If the distance of a galaxy is
Q7: Which of the giant planets was predicted
Q12: Explain why a galaxy can collapse to
Q24: Stars of similar temperatures but different sizes<br>A)
Q26: The critical mass density of the universe
Q39: What is the main observational difficulty in
Q43: Hawking radiation is emitted by a black
Q60: Most asteroids are<br>A) very large <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB4068/.jpg"
Q64: Soon after the Big Bang,we believe the