Moon rocks contain few volatile substances (e.g. water), which implies extra baking of the lunar surface relative to that of Earth. The relative abundance of oxygen isotopes on Earth and on …

One theory states that the debris from the impact was hurtled into space where, due to gravity, it combined. This resulted in the formation of the Moon. The gravitational pull of the Moon on the …

An asteroid is a rocky body in space which may be only a few hundred feet wide or it may be several hundred miles wide. They are considered to be debris left over from the formation of …

The Moon: Earth's Satellite The Moon is the only place in our solar system, other than Earth, where humans have visited. On July 20, 1969, astronauts Neil Armstrong and Edwin Aldrin …

Jupiter's Moon, Io Jupiter's moon Io is 778 million kilometers from the Sun. Except at its volcanic hot spots, Io's surface temperature is well below freezing. Instruments aboard the space probe …

The StarChild site is a service of the High Energy Astrophysics Science Archive Research Center (HEASARC), within the Astrophysics Science Division (ASD) at NASA/ GSFC. StarChild …

The words " solar system " refer to the Sun and all of the objects that travel around it. These objects include planets, natural satellites such as the Moon, the asteroid belt, comets, and …

The Planets and Dwarf Planets A planet is a large space body which reflects the light of a star around which it . The planets in our are classified as inner planets and outer planets. The inner …

Hi'iaka is the larger moon, while the smaller moon was named Namaka. It is believed that these moons formed as a result of a collision between Haumea and some other body. Haumea is …

An asteroid is a bit of rock. It can be thought of as what was "left over" after the Sun and all the planets were formed. Most of the asteroids in our solar system can be found orbiting the Sun …