Meteor showers are
A) usually annual events, as the orbits again intersect.
B) caused by the Earth passing near the orbit of an Earthgrazing asteroid.
C) caused by the Earth passing near the orbit of an old short-period comet.
D) Both A and B are correct.
E) Both A and C are correct.
E
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The Wilkinson Mapping Project gave:
A) ?o = 1, but matter (dark and visible) is only 27% of this, the rest is dark energy. B) a closed universe, where dark matter triumphs over dark energy. C) an exact picture of the nature of dark energy. D) us proof that 90% of matter is dark, only 10% normal. E) the background cosmic temperature is 4.36 K.
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