If you attempted to count the stars in a galaxy at a rate of one every second, it would take around 3,000 years to count them all.
If you drove a car from Earth at a constant speed of 100 miles per hour, it would take about 221,000 million years to reach the center of the Milky Way.
If you traveled to Proxima Centauri, the star nearest to Earth (outside our solar system), the Sun would appear to you to be a bright star in the constellation of Cassiopeia.
In 1066, Halley's comet appeared shortly before William the Conqueror invaded England. The Norman king took it as a good omen; his battle cry became "A new star, a new king."
In 1845, the third Earl of Ross, a wealthy amateur astronomer, built the world's largest telescope on his Ireland estate. The earl's reflecting telescope had a 72-inch metal mirror, and was suspended between two ivy-covered stone walls.
There may be a giant black hole at the center of our galaxy, weighing as much as 4 million Suns. The black hole may be capturing stars, gas, and dust equivalent to the weight of three Earths every year.
Three-quarters of the galaxies in the universe are spiral galaxies. There are three other types of galaxies: elliptical, irregular, and lenticular.
The Andromeda galaxy is the most distant object visible to the naked eye. It is about 12 billion billion miles away.
Time slows down near a black hole; inside, it stops completely.
The atmosphere of Mars is relatively moist. However, because the atmosphere is thin, the total amount of water in the atmosphere is minimal. If all the water in the atmosphere of Mars was collected, it would likely only fill a small pond
Tiny dust particles surround a comet. They are swept into a long tail by the solar wind, which consists of subatomic particles speeding from the sum at speed of hundred of miles per second.
The average surface temperature of the outer planets – Uranus, Neptune, Pluto – is about -364°F, 11 times colder than inside a home freezer.
To an observer standing on Pluto, the Sun would appear no brighter than Venus appears in our evening sky.
The brightest asteroid is called Vesta. It has a diameter of 335 miles and is the only asteroid visible to the unaided eye.
Traveling at the speed of 186,000 miles per second, light take 6 hours to travel from Pluto to Earth
The coldest place in the solar system is the surface of Neptune's largest moon Triton, which has a temperature of -391 degrees Fahrenheit, only 69 degrees Fahrenheit above absolute zero.
Until the mid-sixteenth century, comets were believed to be not astronomical phenomena, but burning vapors that had arisen from distant swamps and were propelled across the sky by fire and light.
The current demand for meteorites is so great that meteor hunters can command $1,000 per pound from eager buyers. Some meteor hunters have become millionaires from the sales of their findings.
Venus has no magnetic field, perhaps because of its slow rotation. It also has no satellites.
The dark spots on the moon that create the benevolent "man in the moon" image are actually basins filled 3 to 8 kilometers deep with basalt, a dense mineral, which causes immense gravitation variations.
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