The planet(s) of our solar system that are never visible to the naked eye are
a. Pluto.
b. Mercury, Neptune, and Pluto.
c. Saturn, Uranus, Neptune, and Pluto.
d. Neptune and Pluto.
e. Mercury and Venus.
D
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Why is it believed that life can not evolve on a planet that orbits a spectral type A, B or O star?
a. These stars produce too much infrared radiation which would destroy carbon-based organisms. b. These stars have very small life zones. c. These stars are not capable of producing planets. d. These stars do not remain on the main sequence long enough for life to evolve. e. These stars take too long to form.
Ohm's Law: What potential difference is required across an 8.0-? resistor to cause 2.0 A to flow through it?
Fill in the blank(s) with the appropriate word(s).
Galileo observed which of the following phases of Venus?
A) full B) new C) crescent D) gibbous E) all of the above
Why do we believe a black hole lies toward Sagittarius?
What will be an ideal response?