One of the first physical processes Newton would revisit at Cambridge was that concerning light. He theorized that even white light was composed of a variety of constituents, each of a different color . ... Hodges notes that this analysis allowed Newton to envision: "light and visibility of objects as a result of the rather mechanical movement of a host of miniscule particles or "corpuscles" of light through air, from object to observer, at the speed of about 168,000 miles per second". In more than one way Newton's theories of light interrelate with his theories of gravity. ... ...

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Also according to the theory of relativity, nothing can travel faster than the speed of light but most compact objects imaginable are predicted by General Relativity to have such strong gravitational force that nothing can escape them- not even light. For this reason, it is called a black hole; light, as a result disappears from the visible universe. John Mitchell, an English geologist, had written a paper in 1783 about the extraordinary strength of gravity- so strong that light could not escape it. ...

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