What species absorbs photons in a protostar's outer layers?
A) H
B) H2
C) H+
D) H-
E) dust
D
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The cosmic microwave background radiation comes from the time when neutral hydrogen atoms formed in the process of _______________
Fill in the blank(s) with correct word
Kim is in a spaceship moving past you at half the speed of light. Which of the following correctly describes how you will perceive each other's time?
A) You will say that Kim's time is running slow, and she will say that your time is running fast. B) You will say that Kim's time is running slow, and she will say that your time is running slow. C) You will say that Kim's time is running fast, and she will say that your time is running slow. D) You will both agree that time runs at the same rate for both of you.
A fatal flaw with Ptolemy's model is its inability to predict the observed phases of
A) the Sun during an eclipse. B) Mars and Jupiter. C) the Moon in its monthly cycle. D) Jupiter and Saturn. E) Mercury and Venus.
How fast must a 6.0-kg cat run to have a kinetic energy of 150 J?
What will be an ideal response?