Mercury's tenuous atmosphere of sodium, magnesium, and potassium comes from:
A) atoms that have been kicked off the surface by the solar wind.
B) volcanic outgassing.
C) residual gases from Mercury's formation.
D) impacts of asteroids or comets.
A
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Astronomers consider the Solar System's Kuiper belt extending beyond the orbit of Neptune as an example of an old debris disk
a. True b. False Indicate whether the statement is true or false
The__________is a theory that proposed to account for spiral arms as compressions of the interstellar medium in the disk of the galaxy
A) spiral relativity theory B) spiral density wave theory C) spiral tracer theory D) spiral arm theory
A 1.8-kg block is projected up a rough 10° inclined plane. As the block slides up the incline, its acceleration is 3.8 m/s2 down the incline. What is the magnitude of the force of friction acting on the block?
a. 5.0 N b. 3.8 N c. 4.2 N d. 4.6 N e. 6.5 N
The absolute magnitude of a star is its brightness as seen from a distance of:
A) one million kilometers. B) one astronomical unit. C) one light year. D) ten parsecs. E) 10 light years.