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I have read a few times that comets are significant transports of ice (perhaps in having supplied water to fill Earth's oceans). That implies that water is more abundant in the few comets (in accumulated mass) that have impacted Earth than that which would have existed within the initial planet when it was forming.
1) WHY is ice more prevalent in comets than in the initial state of a planet?
2) Where did the ice come from when a comet is formed? This question may be equivalent to asking how is a comet formed?
3) Why is H2O, being a light molecule, more prevalent in outer space than other light molecules?
(Thanks in advance for your anticipated replies.)
1) WHY is ice more prevalent in comets than in the initial state of a planet?
2) Where did the ice come from when a comet is formed? This question may be equivalent to asking how is a comet formed?
3) Why is H2O, being a light molecule, more prevalent in outer space than other light molecules?
(Thanks in advance for your anticipated replies.)