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What would cause Earthт??s orbit to become more circular instead of its present elliptical orbit, and has this ever happened before? | <b style="color:black;background-color:#66ffff">Astronomy</b>.com

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What would cause Earthт??s orbit to become more circular instead of its present elliptical orbit, and has this ever happened before?

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FROM THE June 2012 ISSUE

What would cause Earthт??s orbit to become more circular instead of its present elliptical orbit, and has this ever happened before?

Bo Hill, Peachtree City, Georgia

Published: Monday, April 23, 2012

Earth

NASA/NOAA/GSFC/Suomi NPP/VIIRS/Norman Kuring

Gravitational interactions among the planets cause the ellipticities of the orbits to oscillate periodically by a few percent over millions of years.

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