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The youngest stars in the Orion Nebula and other star-forming regions also show
Q2: Using the law of gravity and the
Q6: A type-II supernova<br>A) occurs when a white
Q9: When a large galaxy collides with a
Q17: Interstellar gas clouds may collapse to form
Q19: An E galaxy contains<br>A) mostly lower-main sequence
Q22: For a first quarter moon,apoximately what
Q25: If a light-emitting object is moving away
Q37: Radio maps of our galaxy show spiral
Q50: Seyfert galaxies<br>A) are more common in close
Q55: _ occur when the moon is new