Where did the Moon come from? - NASA
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 the Moon are …
StarChild: The Moon - NASA
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 Earth …
StarChild: The Asteroid Belt - NASA
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 solar …
StarChild: The Moon - NASA
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 landed the …
Jupiter's Moon, Io - NASA
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 Galileo …
StarChild: Facts about the Moon - NASA
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 Authors: …
Why is the crescent moon sometimes lit on the bottom? - NASA
A careful observer will certainly notice that over the period of months, the crescent of the Moon does indeed seem to go from being lit on the "bottom" of the Moon to being lit on the side of the Moon. So …
StarChild: Haumea - NASA
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 shaped like a …
What is gravity? - NASA
Neither are we aware of the pull of lunar gravity on our bodies, but the Moon's gravity is responsible for the ocean tides on Earth. The story of Isaac Newton discovering the laws of gravity by watching …
StarChild: The Planets and Dwarf Planets - NASA
Listen to an audio version of this page. A planet is a large space object which revolves around a star. It also reflects that star's light. Eight planets have been discovered in our solar system. Mercury, …