RXJ1800, a galaxy, lies very near in the sky to the bright star Vega. What is the best explanation for them appearing close together?
A) Their random motions have caused RXJ1800 and Vega to drift to within a few light-years of each other.
B) They coincidentally lie along the same line of sight.
C) Vega must have recently formed in RXJ1800 and been ejected.
D) Vega orbits the center of mass of RXJ1800.
B
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