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Actually Photons Still Move With The Same Speed C In Gravity.

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Posted by Alexander on June 28, 2001 23:00:51 UTC

Ascending in gravitational field, they lose their energy (frequency, or color). If they lose all energy, frequency becomes zero and we can not see such photon - it ceases to exist. But it always moves with c.

Place around black hole from which photon loses all their energy till they get to us is called event horizon. On event horozon, under or over it a photon always moves with the same speed c. That is why it is called a constant - it does not depend on anything.

Clocks near event horizon appear for far away observer to run slow, and for close observer to run normal.

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