Due to the incredible size of the universe, our search for extraterrestrial life will probably be limited to within our
A) Local Group of galaxies
B) Local Supercluster of galaxies
C) Milky Way galaxy
D) solar system
C
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Stars on the main sequence with the greatest mass
a. are spectral type M stars. b. are spectral type O stars. c. are located at the bottom of the main sequence in the H-R diagram. d. have masses very similar to the Sun. e. are spectral type O stars and are located at the bottom of the main sequence in the H-R diagram.
Energy Conservation With Conservative Forces: A person stands on the edge of a cliff. She throws three identical rocks with the same speed. Rock X is thrown vertically upward, rock Y is thrown horizontally, and rock Z is thrown vertically downward. If the ground at the base of the cliff is level, which rock hits the ground with the greatest speed if there is no air resistance?
A. Rock X B. Rock Y C. Rock Z D. They all hit the ground with the same speed.
If an extrasolar planet suddenly became larger in radius, but kept the same mass and orbit, what would change during an observed transit?
A) The amount of starlight would have a larger dip during the transit. B) The amount of starlight would have a smaller dip during the transit. C) The time between transits would decrease. D) The time between transits would increase. E) Nothing. The radius of a planet does not affect the appearance of a transit.
According to modern scientific dating techniques, approximately how long ago did Earth and the other planets of our solar system form?
A) 4.5 billion years B) 10,000 years C) 4.5 million years D) 14 billion years