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Oort-cloud comets are so far from the Sun that the gravity of neighboring stars can alter their orbits.
Q10: This diagram represents the life track of
Q14: What makes us think that Mars must
Q15: What do we mean by a runaway
Q18: The Gaia Hypothesis: The Gaia hypothesis, due
Q49: Why does it make sense that the
Q60: The water-ice particles forming Saturn's rings are
Q81: The Caloris Basin on Mercury covers a
Q109: Viewed from Pluto, the Sun would appear
Q119: Studying a spectrum from a star can
Q149: Earth outgassed as much carbon dioxide as