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Hawking energy

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Negative Energy - Stephen Hawking's Grand Design

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Stephen Hawking's Universe: The Final Big Chill

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What is Dark Matter and Dark Energy?

The Hawking energy or Hawking mass is one of the possible definitions of mass in general relativity. It is a measure of the bending of ingoing and outgoing rays of light that are orthogonal to a 2-sphere surrounding the region of space whose mass is to be defined.
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