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staedtler staedtler
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7 years ago
How has the existence of comets around another star besides the Sun been established?

(a)   The spectrum of water vapor has been observed as the star vaporizes some of its comets.
(b)   The spectrum of ice has been observed at distances of several hundred AU from the star.
(c)   Streams of ions have been observed extending for several AU outwards from the star.
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Discovering the Universe

Discovering the Universe


Edition: 7th
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hyponoticahyponotica
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7 years ago
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staedtler Author
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7 years ago
On behalf of my study group and I, thank you
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