In essence, most of the extrasolar planets discovered to date have been found by

A) closely examining very high-resolution photographs of other star systems.
B) observing a star carefully enough to notice that it is experiencing a gravitational tug caused by an unseen planet.
C) identifying spectral lines that look like what we expect to see from a planet rather than a star.
D) observing mini-eclipses of a star as an unseen planet passes in front of it.


B

Physics & Space Science

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The reaction rate of a chemical reaction doubles when the temperature increases from 10to 50What is the activation energy?

a.
b.
c.
d.
e.

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