because the core of the sun is denser than its surface, the resulting gravitational potential warps time. as a result, the sun's core is 39,000 years younger than the surface.

the same is true of earth, but on a smaller scale: the core is about 2.5 years younger than the crust.

due to the gravity well caused by earth's mass, time in our planet's core is roughly 2.5 years behind the surface.

the 2 satellites that nasa has to detect gravitational anomalies chase each other around the earth. their nicknames are tom and jerry.

some things no one tells you about long-term space travel and the effects of zero-g: 1. mucus collects in your sinuses, so you can't taste much. 2. lack of gravity makes you taller, but your spine was never intended to stretch, so it's painful. 3. your blood pressure drops. that means that you can't get an erection (sorry, there's no 10,000 mile high club) and you'll pass out if you don't exercise more than 2 hours each day.

birds rely entirely on gravity to swallow. put them on a space station, and they starve to death. (it's likely that dinosaurs swallowed the same way.)

the gravity of a neutron star is so great that, if you jumped off a 5 foot tall ladder onto one, you would be traveling at 4 million miles an hour by the time you hit.

deimos, the smallest of mars' 2 moons, has such low gravity that, if you take a running jump on its surface, you will drift off into space.