In order to determine the mass of a planet by applying Newton's laws of motion and gravity, the planet must have:
A) rings.
B) moons.
C) a solid surface.
D) a known size and distance from Earth.
E) planets further from the Sun than itself.
B
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Which of the following best describes how modern astronomers view astrology?
A) Astrology played an important part in the development of astronomy in ancient times, but it is not a science by modern standards. B) Astrology is a synonym for astronomy. C) Astrology was a great idea until it was disprove by the work of Copernicus, Tycho, Kepler, and Galileo. D) Astrology is new age mumbo-jumbo that was a waste of time when it was invented thousands of years ago and remains a waste of time today.
Synthetic compounds that can be molded and hardened are called ______________
Fill in the blank(s) with correct word
Identify some two surface radiation configurations other than those shown in Figure 7- 4.
What will be an ideal response?
What evidence suggests that most of the mass of the Milky Way is in the form of dark matter?
A) The orbital speeds of stars far from the galactic center are surprisingly high. B) Although dark matter emits no visible light, we have detected its radio emissions. C) Theoretical models of galaxy formation suggest that a galaxy cannot form unless it has at least 10 times as much matter as we see in the Milky Way disk. D) Our view of distant galaxies is often obscured by dark blotches, which are presumably made of dark matter.