This Kuiper Belt Object was officially stripped of its planet status and reclassified as a dwarf planet in 2006.

The first man to set foot on the Moon in 1969 during the Apollo 11 mission.

This giant impact crater is the most distinguishing feature of the moon, Mimas, making the moon resemble the "Death Star".

Objects that orbit the Sun at a distance greater than the orbit of Neptune.

This occurs when the shadow of the Moon strikes the Earth.

This KBO is an icy world that orbits the Sun in the frozen fringes of our Solar System taking 285 years to orbit the Sun once.

These grey-colored regions are ancient pools of lava that flooded giant impact basins.

Some scientists believe this moon could be a captured Centaur, a KBO that migrated to the inner Solar System.

These small bodies orbit the Sun between Jupiter and Neptune and typically have the characteristics of both asteroids and comets.

The phase of the moon when it is between the Earth and the Sun.

The largest asteroid in the asteroid belt, it is the closest dwarf planet to the sun.

The main component of lunar maria.

It orbits a common center of gravity with Pluto, and the two worlds are tidally locked together as they orbit.

A large group of asteroids that share Jupiter's orbit around the Sun.

When the Sun and Moon are aligned causing bigger high tides and lower low tides.

The only Trans Neptunian dwarf planet.

This new theory suggests that Earth's moon was formed inside a cloud of molten rock and may have done so before Earth itself formed.

This moon and Iapetus are the only major moons in the Saturnian system that do not orbit closely to the plane of Saturn's equator instead having an irregular elliptical orbit.

Small rocky bodies that orbit the Sun and are believed to be left over from the beginning of the Solar System.

When planets are near the Sun in their orbit, they move faster than when they are further away.

Tombaugh Regio is named for the US astronomer who discovered this dwarf planet in 1930.

The Moon is rotating at the same rate it revolves around Earth, so the same hemisphere faces Earth all the time.

It is the largest and innermost moon of Pluto. It was discovered in 1978 by astronomer James Christy and is nearly 1/8 the mass of Pluto. It orbits a common center of gravity with Pluto, and the two worlds are tidally locked together as they orbit.

An extended shell of icy bodies that lies beyond Pluto and the farthest edges of the Kuiper Belt.

When the spin of the Moon proceeds at a uniform rate while the orbit is at a slightly nonuniform rate. The spin can get a little bit ahead or behind the orbit. Hence the face of the Moon presented to the Earth rocks back and forth by some 6° each month.