單項選擇題A parallax correction is NOT applied to observations of the().

A.stars
B.Moon
C.Sun
D.Planets


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2.單項選擇題A large group of stars revolving around a center is known as a().

A.cluster
B.shower
C.constellation
D.galaxy

4.單項選擇題A first magnitude star is().

A.2.5 times as bright as a second magnitude star
B.3 times as bright as a second magnitude star
C.5 times as bright as a second magnitude star
D.10 times as bright as a second magnitude star

5.單項選擇題A double star is a star that().

A.has a declination equal to twice that of the Sun
B.comprises two stars that appear close together
C.is twice as bright as a single star
D.suddenly becomes much brighter and then fades