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Stars of types and _ are found only in the youngest star clusters.
Q8: 21- cm radio waves are emitted by
Q24: A +6.0 magnitude star is brighter than
Q26: The synodic month is<br>A) about two days
Q33: Which of these objects have NOT been
Q51: At the center of our Galaxy lies<br>A)
Q71: A massive star may change its color
Q82: In its _ stage, the new protostar's
Q86: A star is on the horizontal branch
Q90: Why are there no black dwarfs yet,
Q163: Like Herbig- Haro objects associated with protostars,