A cosmic year is the amount of time it takes the Sun to revolve around the center of the Milky Way, about 225 million years.
Saturn's largest moon is named Titan.
The Earth is the most dense planet while Saturn is the least dense.
The planet Venus has no seasons because it does not tilt as it goes around the Sun.
The sun is 93 million miles from earth, yet it's 270,000 times closer than the next nearest star.
A neutron star is the strongest magnet in the universe.
The planet Venus does not tilt as it goes around the Sun, so consequently, it has no seasons.
A dog was killed by a meteor at Nakhla, Egypt, in 1911. The unlucky canine is the only creature known to have been killed by a meteor.
There are nine planets in our solar system including Earth.
The ancient Greeks attributed the planet to Ares, their god of war, because of its red color.
The planet Venus is named after the Roman goddess of love.
Since Neptune's discovery in 1846, it has made about three-quarters of one revolution of the Sun.
The Sea of Tranquility is on the Moon. It’s not a real sea, but a maria, one of the regions on the Moon that appear dark when looking at it.
The pressure at the center of the Earth is 27,000 tons per square inch.
On Mars the seasons are more exaggerated and last much longer than on Earth.
Venus is the only planet that rotates clockwise.
The pressure at the center of the Sun is about 700 million tons per square inch.
The first spacecraft to visit the planet Venus was Mariner 2 in 1962.
All the planets in our solar system could be placed inside Jupiter.
A pulsar is a small star made up of neutrons so densely packed together that if one the size of a silver dollar landed on Earth, it would weigh approximately 100 million tons.
Saturn has the greatest number of known moons in the solar system.
The star Sirius B is so dense, a handful of it weighs about one million pounds.
The Sun gives off a stream of electrically-charged particles called the solar wind. Every second, the Sun pumps more than a million tons of material into the solar wind.
The planet Venus spins opposite to the other planets in the solar system.
Astronomers once believed a planet named Vulcan existed between Mercury and the Sun.
Jupiter is the fastest rotating planet, which can complete one revolution in less than ten hours.
The Sun is 330,330 times larger than Earth.
A solar day on Mercury, from sunrise to sunset, lasts about six Earth months.
A space vehicle must move at a rate of at least 17 miles per second to escape Earth's gravitational pull.
The Sun contains over 99.8 percent of the total mass in our solar system, while Jupiter contains most of the rest.
A day on the planet Mercury is twice as long as its year. Mercury rotates very slowly but revolves around the Sun in slightly less than 88 days.
