In this perspective view of the solar system, the sizes of the planets are ________ relative to the sizes of their orbits.
A) exaggerated about 1,000 times
B) correctly scaled
C) exaggerated about 10 times
D) exaggerated about 100 million times
A) exaggerated about 1,000 times
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When using different points in the Earth's orbit as a baseline for a parallax experiment it is best to do the observations:
A. 1 day apart. B. 6 months apart. C. 1 month apart. D. 1 year apart. E. 2 years apart.
What did the Universe used to look like?
A.) Transparent. B.) Translucent. C.) Colorful. D.) Opaque. E.) Photons.
The chief erosive agent now on the Moon is
A) lunar ice melting and refreezing in the polar regions. B) lava flows welling up in the mare. C) volcanic vents in the rugged highlands. D) the rain of micrometeorites chewing up the regolith. E) rain from cometary debris melting as it enters the Moon's atmosphere.
What is the upper limit to the mass of a white dwarf?
A) There is no upper limit. B) There is an upper limit, but we do not yet know what it is. C) 2 solar masses D) 1.4 solar masses E) 1 solar mass