For black holes, distant observers will see only the outside of the event horizon, while individual observers falling into the black hole will experience quite another "reality." General relativity predicts that for distant observers outside the horizon, they will experience the three space-like coordinates and one time-like coordinate, as they always have. For someone falling into a black hole and crossing the horizon, this crossing is mathematically predicted to involve the transformation of your single time-like coordinate into a space-like coordinate, and your three space-like coordinates into three time-like coordinates. Along any of these three former space-like coordinates, they now all terminate on the singularity; you're experiencing them as time-like now. All choices always terminate on the singularity"at least in the case of a non-rotating black hole. The coordinate which used to measure external time now has a space-like character which affords you some wiggle room, but dynamically, in terms of these new reversed space and time coordinates, you find that no stable orbits about the singularity are possible no matter what you try to do. Without any stable orbits, and the inexorable freefall into the singularity, relativists often refer to this as the collapse of space-time geometry.
Amazing fact: Mars
Mars is rich in water ice, in fact NASA in 2007 stated that volume of water ice in the south polar ice cap, if melted, would be enough to cover the entire planetary surface to a depth of 11 meters.
Amazing fact: Uranus
Uranus is the coldest planet in the solar system, and gives off less heat than it absorbs from the Sun
Amazing fact: Spacecraft toilet
Spacecrafts toilets have to get rid of waste in low gravity conditions, Astronauts have to sit on a device which sucks away the waste. Solid waste is dried and dumped in space, but the water is saved.
Amazing fact: Typical galaxy
A typical galaxy may contain anywhere between about ten million and one trillion stars. Dark matter makes up roughly 85 percent of the matter in the universe.
Amazing fact: Jupiter
If the planet Jupiter had been 80 times more massive, it would have formed into a star
