Describe the impact the discovery of extrasolar planets h as had for understanding the origin of our own Solar System
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The discovery of extrasolar planets shows, first and foremost, that other planets and planetary systems exist. Indeed, the statistics show that planet formation appears to be rather common. The fact that we find giant Jupiter-like planets very close to the stars demonstrates, however, that planets can move considerable distances from their birthplaces as they interact with the protostellar disk and other planets. The nebular theory of planet formation is therefore being adjusted to allow for planetary migration.
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Why do the spectra of stars differ, if they are all chiefly hydrogen and helium?
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A baseball is moving in the air along the customary parabola. Ignoring air drag, where is the force on the baseball zero?
a. at the top of the parabola c. where it is about to impact b. just when it has started upward d. nowhere
Dry air has a density of 1.29 kg/m3 . What would be the volume of a metric ton of air?
Which of the following telescopes is most suitable for observing cool gas clouds?
A. radio telescope B. visible-light telescope C. X-ray telescope D. All of these choices are correct. E. Cool gas clouds cannot be observed by telescopes.