The first spacecraft to return surface samples of an asteroid was named
A) Dawn. B) Stardust. C) Giotto. D) Hayabusa. E) NEAR.
D
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The theory that the collapse of a massive star's iron core produces neutrinos was supported by
a. the size and structure of the Crab nebula. b. laboratory measurements of the mass of the neutrino. c. the brightening of supernovae a few days after they are first visible. d. underground counts from solar neutrinos. e. the detection of neutrinos from the supernova of 1987.
The Mohorovicic discontinuity was discovered by observing
A) earthquake movement at Earth's surface. B) seismograms of an earthquake. C) changes in rock density. D) all of these
Why are massive main sequence stars not likely to have planets that contain life?
a. The life zones around these stars is too small. b. These stars would sweep away all of the material from which planets could form. c. These stars are too hot to allow water to exist as a liquid on any planets that might form. d. These stars are on the main sequence for too short a time to allow life to evolve. e. These stars are almost always binaries and planetary orbits are unstable around binaries.
Who was the first to successfully explain the photoelectric effect?
a. Planck b. Young c. Bohr d. Einstein