The thin line of Earth's atmosphere and the rising sun.

Artist's concept showing showing a possible inner core of the Earth's moon.

A quarter moon is visible in this oblique view of Earth's horizon and airglow.

Illustration of satellites over Earth's horizon.

The bright sun dissects the airglow above Earth's horizon.

Silhouette of space shuttle Endeavour over Earth's colorful horizon.

Artist rendition of a new spaceship to the moon.

A full moon above Earth's horizon and airglow.

Diagram of Energetic Neutral Atoms from a region outside Earth's magnetopause.

The gray shadow of the moon cast on bright clouds of the northern Pacific Ocean.

A full moon is visible in this view above Earth's horizon and airglow

January 2, 2009 - Cloud simulation of the full Earth.

Illustration of a space shuttle re-entering the Earth's atmosphere.

Diagram of the transparency of Earth's atmosphere to different types of radiation.

Illustration of the peaks surrounding the Peary crater on Earth's moon.

Artist's concept of the Earth, Pluto, Charon, and Earth's moon to scale.

Illustration of Enceladus in front of the Earth and next to Earth's moon.

Earth and the moon.

Full moon in clouds.

Moon, Venus and Jupiter Conjunction.

Earth, moon and the sun.

Moon, Venus and Jupiter Conjunction.

Terraforming the moon with water and buildings.

New Earth based moon project called Hyperion.

Moon colony, artwork

Earth and moon, artwork

Astronaut on the Moon, artwork

Earthrise from the Moon, artwork

Astronaut on the Moon, artwork

Antique Celestial Illustration (aquatint) showing the relationship the Earth's Orbit around the Sun and the Moon's Orbit around the Earth., 1842

Astronaut on moon with Earth in the background.

Artist's concept of the Earth and its moon.

Antique Celestial Illustration (hand-colored engraving) of the Sun-centered Copernican System. Also illustrated are the Earth’s positions relative to the Sun at the beginning of each season.,1708

A full moon rising behind a row of hilltop trees.

Artist's concept of a windy planet with a thick atmosphere.

Cosmic image of solar flares hiting the moon.

Moon Walk

Moon Walk

Solar System

The moon and Earth's atmosphere