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Artist's concept, shows Earth
8. The Infrared Astronomy Satellite, launched in 1983, detected the first-ever know disk around a star. What do scientists believe about these disks?
  A They are made of gas and dust.
  B The disks may be where planets form.
  C More recent space telescopes, like Spitzer, have observed disks around lots of stars.
  D All of the above.

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History Quiz
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