What is Charon?
What will be an ideal response?
Pluto's largest moon
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Describe the kind of observations that have led astronomers to believe that supermassive black holes lie at the center of many galaxies
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This Hubble Space Telescope photo shows the bright active galactic nucleus in the center of galaxy M87. What is the long bluish streak coming out of it?
A) a "jet" of material being shot out at high speed B) the blueshifted light of gas that is moving toward us C) a stream of material that is falling in toward an accretion disk D) a spiral arm filled with regions of active star formation
A double-convex thin lens is made of glass with an index of refraction of 1.52. The radii of curvature of the faces of the lens are 60 cm and 72 cm. What is the focal length of the lens?
A) 70 cm B) 63 cm C) 75 cm D) 66 cm E) 58 cm
How have scientists been able to determine that Earth has a liquid metal outer core?
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