Professor Questions Unit 2 Essay 1 : Spring , summer , autumn and winter are the four seasons majority of the places on earth go through every year . There is a question which people find difficult to answer . What causes the earth 's climate changes ? There is a misleading belief that the changing distances of the sun from the earth bring about the seasons . This is not true . So what really causes these changes ? There are many issues involved , but the leading cause...

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Professor Questions Unit 6 1 . Discuss how astronomers compare the stars . There may be several terms astronomists use to compare stars , including luminosity , flux , energy flux , apparent magnitude and absolute magnitude . Luminosity is the measured in Watts Energy flux is the flow of energy out from a particular surface area and is measured in Watts per meter square . Observed flux - As the radius of the circle placed around the radiating object increases , the flow of energy per meter square would...

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