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A．They studied variations in the appearance of the parent stars.B．They were able to see the planets with a telescope.C．They compared the parent stars to the Sun.D．They sent astronauts on a mission into space.
A．They studied variations in the appearance of the parent stars.
B．They were able to see the planets with a telescope.
C．They compared the parent stars to the Sun.
D．They sent astronauts on a mission into space.
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