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Strong evidence for the existence of planetary systems in the process of formation around other ...

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Strong evidence for the existence of planetary systems in the process of formation around other ...

Strong evidence for the existence of planetary systems in the process of formation around other stars comes from
A)   spectroscopic evidence of large quantities of molecules such as ammonia and methane, which can exist only in planetary atmospheres.
B)   photographs and infrared observations of disks of dust.
C)   detection of very regular pulses of radio energy from some stars.
D)   direct photography of actual planets near other stars.

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Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein

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