If you found absorption from _________ in the spectrum of a planet, you could conclude that it might contain some form of life.
a. oxygen
b. methane
c. water vapor
d. oxygen, methane, or water vapor
d. oxygen, methane, or water vapor
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A CD has a diameter of 12.0 cm. If the CD is rotating at a constant angular speed of 200 revolutions per minute, then the tangential velocity of a point on the circumference is
A. 1.76 m/s. B. 1.54 m/s. C. 1.41 m/s D. 1.26 m/s. E. 1.07 m/s.
Which technology was used by the Event Horizon Telescope project to obtain the first image of a black hole?
A) gravitational wave detection B) adaptive optics C) interferometry D) high-speed time monitoring
Astronomers now speculate that a galaxy's shape depends on all of the following except
a. the rate of star formation. b. the history of past collisions. c. the mass. d. All of the other choices may be important in determining a galaxy's shape.
Helium has chemical properties similar to
A. hydrogen. B. lithium. C. neon. D. boron.