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Which Dutch astronomer showed that the Milky Way rotates differentially?
Answer
Jan Oort
What radio line first mapped the Milky Way's spiral structure after 1952?
Answer
21-centimeter line
What gas stream extends behind the Large and Small Magellanic Clouds?
Answer
Magellanic Stream
What is the third-largest galaxy in the Local Group, after Andromeda and the Milky Way?
Answer
Triangulum Galaxy
Which galaxy cluster forms the heart of the Virgo Supercluster?
Answer
Virgo Cluster
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What radio line first mapped the Milky Way's spiral structure after 1952?
Answer
21-centimeter line
What gas stream extends behind the Large and Small Magellanic Clouds?
Answer
Magellanic Stream
What is the third-largest galaxy in the Local Group, after Andromeda and the Milky Way?
Answer
Triangulum Galaxy
Which galaxy cluster forms the heart of the Virgo Supercluster?
Answer
Virgo Cluster
What plane does the bright band of the Milky Way trace across the sky?
Answer
Galactic plane
Which supercluster includes the Virgo Supercluster and the Milky Way?
Answer
Laniakea Supercluster
Which dense young star cluster lies near the Milky Way's Galactic Center?
Answer
Arches Cluster
Who used globular clusters to show the Sun is far from the Milky Way's center?
Answer
Harlow Shapley