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Question 4IncorrectMark 0.00 out of 5.00Flag questionQuestion textMany large telescopes have been built on the 4200m summit of Mauna Kea in the HawaiianIslands because [CHECK ALL THAT APPLY]Select one or more:A. The high altitude means the telescopes are closer to the objects being studied and canthus see more detail.
B. The high altitude site provides excellent "seeing" allowing sharper images to beobtained.C. The site is very dry, minimizing absorption of radiation by water vapour in theatmosphere.D. The high altitude site is above the cloud layers and so the observatory is unaffected byclouds.FeedbackThe correct answers are B and C. The high altitude does not make the observatorysignificantly nearer to astronomical objects because the altitude is negligible compared withastronomical distances. While the site is high enough to be above some low altitude clouds, itis still affected by high-altitude cirrus clouds and by fog forming over the mountain.The correct answer is: The high altitude site provides excellent "seeing" allowing sharperimages to be obtained., The site is very dry, minimizing absorption of radiation by watervapour in the atmosphere.Question 5CorrectMark 5.00 out of 5.00Flag questionQuestion textJupiter's Moon Europa has been suggested as having a liquid water ocean beneath its icysurface. Which of the following techniques might be used by a future spacecraft to confirmthe presence of an ocean.[CHECK ALL THAT APPLY]
A. Optical spectroscopy to look for the spectral signature of liquid water.B. The use of radar to map the boundary between water and ice.C. Detailed analysis of the spacecraft's orbit to determine the gravitational field of Europaand hence constrain its internal structure.D. X-ray observations to see through the ice and into the ocean.FeedbackThe correct answers are B and C. Ice penetrating radar and orbital analysis are techniquesproposed for future Europa missions. Optical spectroscopy is not effective for detectingliquid water that is buried beneath ice. X-rays are also not effective in seeing through largethicknesses of ice.The correct answer is: The use of radar to map the boundary between water and ice., Detailedanalysis of the spacecraft's orbit to determine the gravitational field of Europa and henceconstrain its internal structure.Question 6CorrectMark 5.00 out of 5.00Flag questionQuestion textCataclysmic variable stars are[CHECK ALL THAT APPLY]
C. observed to have light variations in the form of outbursts above a general quiescentlevel.D. known to occur in a number of types, one of which is the Cepheid variables.FeedbackA and C are the correct answers. B and D are incorrect as they refer to "pulsating variablestars", the other main type of variable.The correct answer is: commonly binary systems composed of a main sequence star and awhite dwarf., observed to have light variations in the form of outbursts above a generalquiescent level.

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Term
Three
Professor
Bailey
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