The first extrasolar planets discovered are small and have long orbital periods.
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Q12: The dense disks of gas and dust
Q13: Kuiper belt objects are small, rocky bodies
Q14: Asteroids are believed to be debris left
Q15: Which best describes the appearance of an
Q16: Jupiter and Saturn are so massive that
Q18: The Kepler space telescope is searching for
Q19: Kuiper belt objects appear to be ancient
Q20: Water vapor, methane, and ammonia were abundant
Q21: Descartes' hypothesis of solar system formation was
Q22: Planetesimals beyond the orbit of _ failed
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