# Final-Astro.docx - Startedon State Completedon Timetaken...

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Started onSunday, 8 February 2015, 8:38 PMStateFinishedCompleted onSunday, 8 February 2015, 9:50 PMTime taken1 hour 11 minsGrade73.33 out of 100.00QuestionCorrectMark 5.00 out of 5.00Flag questionQuestion textAn object similar to a star but with too low a mass (less than about 0.08 solarmasses) for nuclear reactions to occur in its core is calledSelect one:1A. a white dwarfB. a brown dwarfC. a red dwarfD. a hot jupiterFeedbackThe correct answer is B - a brown dwarf.The correct answer is: a brown dwarf2
QuestionCorrectMark 5.00 out of 5.00Flag questionQuestion textThe radial velocity (or "Doppler wobble") technique for detecting exoplanetsworks by
A. measuring the change in velocity of the star due to the gravitational pull ofthe orbiting planet.B. measuring the change in position of the star as the planet moves around it.C. measuring the change in velocity of the planet as it orbits the star.D. measuring the dip in brightness as the planet passes in front of the star.FeedbackAnswer A is correct. Answer C is incorrect as it the velocity of the star, not theplanet that is measured. Answers B and D relate to other methods of planetdetection.The correct answer is: measuring the change in velocity of the star due to thegravitational pull of the orbiting planet.QuestionCorrectMark 5.00 out of 5.00Flag questionQuestion textGalileo used his telescope to discover the following?[CHECK ALL THAT APPLY]34
QuestionPartially correct
Mark 3.33 out of 5.00Flag questionQuestion textWhat features in the spectrum of an extrasolar terrestrial planet might provideevidence for life on the planet?[CHECK ALL THAT APPLY]

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Term
Three
Professor
Bailey
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