Wednesday, January 19, 2005

The speed of gravity

So apparently they proved 2 years ago that the speed of gravity is the same as the speed of light. What? you ask. Make sense.

Okay. If the sun were to disappear, we wouldnt see that disappearance for 8 minutes, right, because it takes the light of the sun 8 minutes to get to the earth. But, what they have discovered, is that if the sun were to disappear, not only would we still see it for 8 minutes BUT the earth would continue to rotate around it as though it were still there - for 8 minutes. How weird is that? That's kind of cool cuz it means that it's like something just isn't THERE until the light gets to us, it cannot affect us. UNLESS the gravity travels through some higher dimension, which is the theory they are playing with.

But that means maybe there is some giagantic object just beyond the current reach of our farthest telescopes - something so big that its gravity would eat the entier galaxy in an instant. We would not feel its gravity until the instant that we saw it. Maybe. How weird.

I think the Barenaked Ladies are my favorite band. They are just really damn good and manage to be entirely unpretentious at the same time.

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