Time Dilation- slowing or speeding up time. Acceleration Time Dilation as an object travels faster time will slow down. If an object were traveling 10,000 mph for a few days the time dialtion would be in nanoseconds, but if an object were traveling the speed of light time would "stop". The time would stop for the object untill something not going that speed brung it out of the speed of light. Gravitational Time Dilation - the closer an object is to a huge mass the slower time would pass. If the mass of Jupiter were in a 5 Meter sphere, every one second inside the sphere would be four seconds outside the sphere. If you look at the grean scheme of things that mass of Jupiter is not that great, it has enough mass/gravity to keep its moons around it, but if you "look" at a blackhole it has that mass/gravity to keep hundreds of millions of stars around it. If a person could get close enough to it (without getting to sucked into it) the time dilation could be enormous.