The color of a star is a measure of its
A) surface temperature
B) chemical composition
C) mass
D) size
A
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Identify a true statement about Population II stars
A) Most of them are post-main sequence stars. B) They are located in the disk component of the galaxy. C) Most of them follow elliptical orbits. D) They have higher metal content than Population I stars.
Why do astronomers suspect there may be a ninth planet beyond Neptune?
A. The Kuiper Belt is not in the expected position. B. Pluto has more moons than it should. C. Several Trans-Neptunian Objects have elongated orbits yet are all currently closest to the Sun. D. Neptune's orbit extends closer to the Sun than expected.
The tension in a string from which a 4.0-kg object is suspended in an elevator is equal to 44 N. What is the acceleration of the elevator?
a. 11 m/s2 upward b. 1.2 m/s2 upward c. 1.2 m/s2 downward d. 10 m/s2 upward e. 2.4 m/s2 downward
The oceanic conveyor is often referred to as thermohaline circulation. Explain why this is an appropriate name
What will be an ideal response?