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#1
January 10th 08, 01:57 AM
posted to sci.astro
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Gravity and lightspeed question
A star is a billion light years from earth. Today, we see the light
it emitted a billion years ago. A billion years ago, it was more massive than it is today. That star's gravity is acting on the earth today, ever so slightly. Question: Is the gravity we "feel" from that star a result of its billion-year-ago mass, or its mass today? [Not a quiz; I don't know the answer, and have been intending to ask this for some time.] 
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