Kepler used Tycho's observations to show that the planets
a. followed perfectly circular orbits.
b. followed perfectly cubical orbits.
c. all circled the Earth.
d. followed elliptical orbits.
d
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How many Torino 2 asteroids are known to exist?
a. 0 b. <5 c. 5-10 d. >10
The Great Explosion of Eta Carinae expelled about ________ solar masses of material and released about as much visible energy as a supernova
Fill in the blank(s) with correct word
Briefly describe one of the three questions left unanswered by the standard Big Bang theory which are solved by inflation. That is, describe either the structure problem, the uniformity (or smoothness) problem, or the density (or flatness) problem
What will be an ideal response?
In what way is Pluto more like a comet than a planet?
A) It sometimes enters the inner solar system. B) It is made mostly of rock and ice. C) It has a long tail. It has a moon.