Observations of young stars suggest that when the Sun was young, the solar wind
A) was weaker than it is today.
B) was stronger than it is today.
C) was about the same strength as it is today.
D) was nonexistent.
E) blew outward only along the Sun's poles.
B) was stronger than it is today.
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According to Gwen back on Earth, about how long does it take Jackie to reach Vega?
A) about a month B) about 10 years C) about 25 years D) about 100 years E) about 1,000 years
A camera with a 20-cm diameter lens is recording images using a filter that allows only light of wavelength 600 nm to pass through
(a) What is the limit on the angular resolution (in microradians) in this case? (b) What is the diameter of the minimum-sized features that could be resolved on Mars with this camera? The distance to Mars at the time is 9.0 × 107 km.
Which of these is NOT a result of plate tectonics?
A) the Mid-Atlantic Rift B) the Philippine Trench C) the San Andreas Fault D) the Grand Canyon E) the Andes
It is observed that, as bubbles rise in a deep column of water, the diameter of the bubbles increases. This is best explained by
A. Archimedes' Principle. B. Pascal's Principle. C. Bernoulli's Principle. D. Boyle's Law.