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In the geocentric model of the solar system developed by Ptolemy, the planets move
Q73: How many constellations does the zodiac contain?<br>A)
Q143: Which of the following types of telescopes
Q158: One nanometer (nm)is equal to:<br>A) 10-¹² m.<br>B)
Q160: An observer can see a total solar
Q191: The Doppler effect is the change in
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Q288: In the years after Newton published his
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Q368: The mean distance of Saturn from the