Assignment 5Multiple ChoiceIdentify the letter of the choice that best completes the statement or answers the question.____1.What is the single most important reason that astronomers have learned more about our planetary system in the last 30 years than all of history before then.a.astronomers today are a lot smarter than astronomers were earlierb.the Hubble Space Telescopec.we have been able to send spacecraft to visit many planets and satellitesd.radio telescope arrays allow astronomers to make out details on the planets that they have never been able to see beforee.the planets (moving in their slow orbits around the Sun) happen to be closer to the Earth in the last 30 years than at any previous time in human history
____2.Usually, the most distant planet from the Sun in the solar system is:
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____3.Which planet in the solar system has not been examined up close by spacecraft?
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____4.In the far future, a visiting tourist from another planetary system asks to see the most massive object in our solar system. Where would you take him/her/it?
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____5.All the planets (without exception)a.have solid surfacesb.have thick atmospheresc.have satellites orbiting around themd.revolve (orbit) around the Sun in the same directione.rotate on their axes in the same direction that they revolve around the Sun