The orbit of the planet Jupiter is ellipse with the Sun at one focus. What is located at the other focus?
a. The asteroid belt
b. Earth
c. Saturn
d. Jupiter
e. Nothing
E
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Electrons orbit an atomic nucleus like planets orbit the Sun
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The clouds that orbit around the earth is called ___________________.
Fill in the blank(s) with the appropriate word(s).
This image combines a visible-light view of the galaxy Hercules A with an image showing radio wave emission (the reddish colors) in its vicinity. The likely explanation for the two huge clumps of radio emission far to either side of the visible galaxy is
A) the radio emission comes from gas shot out into space by jets powered by a supermassive black hole in the galactic center. B) the radio emission comes from gas that was left behind in the halo when the galaxy collapsed from a protogalactic cloud. C) the radio emission comes from gas pulled out of the galaxy when it collided with another galaxy in the distant past. D) this galaxy must have suffered two collisions in the past, with each collision pulling out gas in one direction.
The Greek letter designation conveys information about a star's location and brightness
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