GK
THE UNIVERSE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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No. All hot stars emit red-colored light.
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Yes. All moving objects emit red-colored light.
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No. The red-colored light emission is due to the composition of the star.
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Yes. Light from any object moving away from Earth shifts to red-colored light.
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Detailed explanation-1: -The researcher finds that the light received from the star falls slightly closer to the red end of the electromagnetic spectrum when compared to a similar source closer to Earth. The researcher claims that the star is moving away from Earth. Is the researcher correct? No.
Detailed explanation-2: -What can be said about the gravitational attraction of the Sun on the planets from the given data? The planets closer to the Sun revolve faster as they experience more gravitational attraction from the Sun.
Detailed explanation-3: -Astronomers believe that the universe is expanding-that all points in the universe are getting farther apart all the time. It’s not that stars and galaxies are getting bigger; rather, the space between all objects is expanding with time.