Though their contributions to astronomy were different, Galileo and Copernicus were astronomers during the same time period
a. True
b. False
Indicate whether the statement is true or false
False
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Mathematical models indicate that ____ galaxies are produced by high speed collisions in which a smaller galaxy passes through another galaxy almost perpendicular to the disk of the galaxy
a. ring b. spiral c. antenna d. irregular e. tidal tail
The high _______________ of quasars reveals to astronomers that they must be very distant
Fill in the blank(s) with correct word
Elements heavier than hydrogen and helium constitute about ________ of the mass of the interstellar medium
A) 0.002% B) 2% C) 70% D) 98%
How do we test our computer models for the interior of the Sun?
A) taking movies of the solar prominences and flares B) sending a probe to the Sun to plunge into its interior C) monitoring the helium content of the surface of the Sun D) comparing model predictions to how the Sun actually vibrates