Stay Away From Earth


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This difference is, of course, too small to detect with the eye.


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Peter Lowenstein in Mutare, Zimbabwe — who captured the photos and created the composite — wrote: That makes summer the longest season in the Northern Hemisphere and winter the longest season on the southern half of the globe. Conversely, winter is the shortest season in the Northern Hemisphere, and summer is the shortest in the Southern Hemisphere, in each instance by nearly five days.

Earth at perihelion and aphelion to Planet Earth reaches its most distant point from the sun for on July 6. EarthSky astronomy kits are perfect for beginners.

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Today, she serves as Editor-in-Chief of this website. She has won a galaxy of awards from the broadcasting and science communities, including having an asteroid named Byrd in her honor.


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    How Far From Earth Have Earthlings Died?

    Want more news like this? One of the questions I received seems so simple, yet nobody seems to be able to answer it. The question was, "How does the moon stay suspended in the air? Why does it not fall out of the sky if it is not hanging from anything?

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    Your question has two answers: The elementary answer stems from Newton's laws of gravity. A complete answer, however, was only worked out by Einstein at the start of the last century. A the simple answer to "why does the Moon stay suspended in the air?


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    There is a gravitational force between the Moon and the Earth, that tries to pull the Moon toward the latter. This constant tug on the Moon as it moves around the Earth is called a "centripetal" force. This force is balanced by the "centrifugal" force, that pulls on the Earth and keeps the moon in motion.

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    For a technical description of the subtle difference between centripetal and centrifugal forces check out this page. It is the balance between the centripetal and centrifugal forces that keep the Moon in orbit around the Earth. One can be more persistent than that, however, and this is where the subtlety comes about. Why do the centripetal and centrifugal forces exactly balance each other?

    Because otherwise the Moon would come crashing into Earth. But why does the Moon not come crashing into Earth?

    Why Don’t We Fall Off the Earth? | Mental Floss

    Because the centrifugal force exactly balances the centripetal force. The reasoning here is circular: The why was only supplied by Einstein in the early s. A more thorough answer to "Why does the Moon stay suspended in the air? We think that Einstein's Theory of General Relativity explains the properties of space and time in the Universe.

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    Within that theory, objects with mass curve spacetime in their vicinity, and this curvature influences the motions of other objects. The greater the mass and density of the object, the larger the curvature of spacetime that results. So, the Moon orbits the Earth because the Earth curves spacetime in the vicinity of the Moon. Though the Moon itself curves space as well since it has mass , the curvature in the vicinity of the Moon is dominated by the Earth, which "tells" the Moon to orbit the Earth, given the Moon's current position and motion in the sky.

    It is this interplay between mass and curvature that causes the gravitational and the centripetal forces in the first place, and thus why the simple explanation holds. And you can understand how it does by analyzing the forces on the Moon caused by its orbit and finding the forces pushing in and out are equal.

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