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Waspie_Dwarf

Sun Studied by Tracking Motion of Mercury

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Waspie_Dwarf

NASA Team Studies Middle-aged Sun by Tracking Motion of Mercury

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Like the waistband of a couch potato in midlife, the orbits of planets in our solar system are expanding. It happens because the Sun’s gravitational grip gradually weakens as our star ages and loses mass. Now, a team of NASA and MIT scientists has indirectly measured this mass loss and other solar parameters by looking at changes in Mercury’s orbit

The new values improve upon earlier predictions by reducing the amount of uncertainty. That’s especially important for the rate of solar mass loss, because it’s related to the stability of G, the gravitational constant. Although G is considered a fixed number, whether it’s really constant is still a fundamental question in physics.

arrow3.gif  Read More: NASA

 

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