The most important fact about a cluster of stars that makes them useful for studying star formation is that
A) all the stars formed from the same cloud.
B) all the stars formed at about the same time.
C) all the stars are at the same distance from Earth.
D) all the stars have the same chemical composition.
E) all the stars are the same spectral type.
B
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The sky appears to rotate eastward around Earth each day, but that is a consequence of the westward rotation of Earth
a. True b. False Indicate whether the statement is true or false
What makes silicon an unlikely source as the basis of life?
What will be an ideal response?
Refracting telescopes suffer from ____________________ aberration
Fill in the blank(s) with correct word
Why does Earth have the strongest magnetic field among the terrestrial worlds?
A) It is the only one that has a metallic core. B) It rotates much faster than any other terrestrial world. C) It is the only one that has both a convecting core region and reasonably rapid rotation. D) It is by far the largest terrestrial world. E) It is the most volcanically active world.