If we imagine an astronaut on a voyage past the Sun, she will find that her clock runs slower the closer she gets to the Sun. Not by much though, since the effects of General Relativity are neg ligible within the Solar System. It is a very real effect though. In the 1960's, an experiment was performed in Harvard with a gamma ray clock that demonstrated this so called gravitational time dilation. Atomic clocks flown on commercial airliners have also been shown to differ from their Earth based counterparts, e ven after special relativistic effects were taken into consideration.
Time comes to a stand still.
A black hole is possibly the most breathtaking of the consequences of General Relativity. We shall concentrate on stellar black holes, the remnants of the most massive stars in our Universe. The Family Stars are born in gasous nebulae, light years in diameter. Part of clusters, because of random motion, they disperse, and follow a path along the Main Sequence. There are natural limits to the masses of these relic stars.