What type of observation can astronomers use to measure the composition of an extrasolar planet's atmosphere?
A) comparisons of a star's spectrum when a planet is in transit versus when it is eclipsed
B) measurements of the host star's velocity throughout an orbital cycle
C) measurement of how frequently the planet blocks the host star's light
D) combination of a transit observation and a Doppler shift measurement
A) comparisons of a star's spectrum when a planet is in transit versus when it is eclipsed
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An apparent westward motion of a planet in the sky compared to the background stars (as viewed from Earth) when observed on successive nights is referred to as
a. epicycle. b. retrograde motion. c. prograde motion. d. heliocentric motion. e. deferent.
Which Mars orbiter has been measuring the escape of gases from the Martian atmosphere?
A) Mars Express B) Mars Reconnaissance Orbiter C) Mars Orbiter Mission D) MAVEN
The energy that stirs the circulation in Jupiter's atmosphere comes from ________.
A. the tidal force of the Galilean moons B. the planet's magnetic field C. the planet's interior D. the Sun
A force F is applied to a cylindrical roll of paper of radius R and mass M by pulling on the paper as shown. The acceleration of the center of mass of the roll of paper (when it rolls without slipping) is
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A.
.B.
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