Blue stars are hotter than red stars
a. True
b. False
Indicate whether the statement is true or false
True
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Stars in the same constellation
a. probably formed at the same time. b. must be part of the same cluster of stars in space. c. must have been discovered at about the same time at the same location in space. d. may actually be very different distances away from the observer and from each other.
What do most astronomers now think explains why active galaxies are so energetic?
A. intense magnetic fields B. a supernova explosion C. an immense black hole D. None of these choices is correct.
The average size of a white dwarf is about the same size as the Earth
a. True b. False Indicate whether the statement is true or false
A lens must be ________ in shape to focus the transmitted light
Fill in the blank(s) with correct word