Comets speed up as they approach the Sun – sometimes reaching speeds of over a million miles per hour. Far away from the Sun, speeds drop, perhaps down to as little as 700 miles per hour.
Deimos, one of the moons of Mars, rises and sets twice a day
During an eclipse of the sun in 1868, spectral lines were located that were attributed to an unknown element that was called "helium," from the Greek word for "sun." Thirty years later, helium was discovered on Earth.
Earth is estimated to be 4.5 billion years old. It travels through space at 660,000 miles per hour.
More than one million Earths would fit inside the sun.
Neil Armstrong's spacesuit during training brought $178,500 at a recent auction. This was more than double its presale estimate.
On August 11, 1960, an 85-pound instrumented capsule, ejected from the Discoverer XIII satellite, was recovered off the coast of Hawaii after making only 16 orbits. It was the first man-made object recovered from space.
On February 17, 1959, Vanguard II was the first satellite to send weather information back to Earth.
On the planet Jupiter, your weight would be nearly three times greater than it is on Earth.
On Venus, the Sun rises in the west and sets in the east, the opposite of the Earth. Venus rotates from east to west, not from west to east as the Earth and the other planets do.
One year on Saturn is 29 and a half times longer than ours, but its day is shorter than ours, 11 and a half hours.
Our galaxy has approximately 250 billion stars – and it is estimated by astronomers that there are 100 billion other galaxies in the universe.
Our galaxy probably contains millions of old neutron stars that have stopped spinning, and so are undetectable.
Earth is putting on weight day by day as meteors and microscopic space dust falls from space.
Estimates are that at least a million meteors have hit Earth's land surface, which is only 25 percent of the planet. Every last trace of more than 99 percent of the craters thus formed has vanished, erased by the effects of wind, water and living things.
Even though there were only six manned lunar landings, there are seven Apollo lunar landers on the moon. Apollo X, as part of their mission, dropped their lunar lander to test seismic equipment that had already been set up on a previous mission.
Experts believe that Manhattan is possibly the worst place in the U.S. to attempt stargazing during a clear night sky. Because of air pollution haze and city lights, the moon and the bright planets are about all that can be seen clearly.
Five times as many meteors can be seen after midnight as can seen before.
Four million tons of hydrogen dust are destroyed on the Sun every second
Free-moving liquid in outer space will form itself into a sphere, because of its surface tension.
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