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ASTR 101 Final Exam With Actual Questions And Verified Detailed Answers
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ASTR 101 Final Exam With Actual Questions AndVerified Detailed Answers
What is an extrasolar planet?
A planet that orbits a star other than our Sun.
A "solar extra," in that it was not necessary for the formation of its solar system.
A planet larger than the Sun.
A planet that is extra large compared to what we'd expect - Answer A planet that orbits a
star that is not our own Sun
"Extrasolar" means "beyond the Sun."
The first confirmed detections of extrasolar planets occurred in ____________.
2009
the mid-20th century
the 1990's
the mid-17th century - Answer the 1990's
Among the first few hundred extrasolar planets, most were discovered by ____________.
the Doppler technique
the astrometric technique
the Hubble Space Telescope
, the transit technique Answer the Doppler technique
The Doppler technique tells us what, about an extrasolar planet?
the planet's radius
the planet's minimum mass
the planet's density
all of the above Answer the planet's minimum mass
Why do we say that the Doppler technique gives the planet's "minimum mass"?
The amplitude of the Doppler shift we measure will depend on the tilt of the planet orbit.
Mass of the star has got to be known, which can be very uncertain to determine it. The
Doppler Measurements are extremely challenging to deal with noisy data, and hence the
astronomers result in underestimating the mass of the planets.
Extrasolar planets are always increasing in mass. - Answer The size of the Doppler shift
that we detect depends on whether the planet's orbit is tilted.
Which detection techniques can find the planet's orbital distance (assuming we know
the mass of the star)?
only the transit technique
only the astrometric technique
only the Doppler technique
all of these techniques - Answer all of these techniques
Which of the following is not a characteristic of planets so far found around other stars?
a) Most are far more massive than Earth.
b) A picture shows that most have atmospheres much like Jupiter's.
c) The majority have been found by measuring Doppler shifts in the star the planet
orbits.
Many of them orbit closer to their star than Jupiter orbits the Sun. - Answer Photographs
reveal that most of them have atmospheres much like that of Jupiter.
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