When we look at the farthest visible star we are looking 4 billion years into the past—the light from that star traveling at 186,000 miles a second, has taken that many years to reach us.

If one were to capture and bottle a comet's 10,000 mile vapor trail, the amount of vapor actually present in the bottle would take up less than 1 cubic inch of space.

Because of Pluto's irregular orbit, there are periods of times when it is closer to the sun than Neptune.

Pluto's thin atmosphere contains traces of methane, nitrogen and carbon dioxide.

The sun would look like a bright star from Pluto, since they are so far away from each other.

Pluto has an enormous moon for its size, Charon. It is more than half the size of Pluto. It currently has five observed moons.

The color of Pluto is reddish-brown.

The color of Pluto is reddish-brown.

Pluto is smaller than the Earth's moon.

Neptune is so far away that it took the space probe Voyager 2, 12 years to reach it.

Neptune is the stormiest planet. The winds there can blow up to 1,240 miles per hour, that is three times as fast as Earth's Hurricanes.

The atmosphere of Neptune is made up of Hydrogen, Helium and Methane.

Neptune is a sea blue color due to the methane gas in its atmosphere.

Neptune is 30 times farther from the sun as is the Earth.

Neptune has 8 known moons.

Because of the strange way it spins, nights on some parts of Uranus can last for more than 40 years.

Even though Neptune is further from the sun, Uranus is the coldest planet in the solar system.

Neptune is a sea blue color due to the methane gas in its atmosphere.

Uranus is the second least dense planet after Saturn.

It takes 30,685 Earth days for Uranus to complete an orbit around the sun.

Uranus mass is more than 14 times larger than Earth.

Saturn has no solid surface. It is a giant ball of gas, but it does have a solid inner core.

Saturn has over 30 known Satellites, but many of them are small and faint.

Saturn's rings are made up of billions of pieces of rocks and dust.

It takes about 29.46 Earth years for Saturn to orbit around our sun.

Saturn has the lowest density of all the planets in the solar system. It is so light that it could actually float on water if there was an ocean big enough to hold it.

A 100 pound object on Earth would weight 116 pounds on Saturn.