The Crab Nebula is the remnant of ____
a. the SN1987a supernova
b. a supernova which triggered a mass extinction on Earth
c. a supernova recorded by Chinese astronomers
d. a supernova which triggered the formation of the Sun
e. a supernova in the Large Magellanic cloud
c
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Why is Io's orbit about Jupiter slightly elliptical?
A) because of tidal forces due to Jupiter B) because Io was captured C) because of orbital resonances with the other three Galilean moons D) because of a giant impact which occurred in the past
According to its rotation curve, the majority of our Galaxy's mass is ________
Fill in the blank(s) with correct word
A light board, 10 m long, is supported by two sawhorses, one at one edge of the board and a second at the midpoint. A 40-N weight is placed between the two sawhorses, 3.0 m from the edge and 2.0 m from the center
What forces are exerted by the sawhorses on the board?
The ________ variables in the closer globular clusters were used by Harlow Shapley to find their distances
Fill in the blank(s) with correct word