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Astro Guide

Inner Planets

Mercury

Venus

Venus

Earth

Earth

Mars

Mars

Outer Planets

Jupiter

Jupiter

Saturn's rings

Saturn

Uranus

Uranus

Neptune

Neptune

Minor Bodies

Mars meteorite

Meteorites

Comet

Comets

Asteroid

Asteroids

Pluto

Craters and Extinctions

Moons

Earth’s Moon

Mars' Moons

Jupiter's Moons

Saturn's Moons

Neptune's Triton

Stars

A giant plume of hot gas explodes from the Sun's surface. Giant bubbles of hot g

Our Star, the Sun

Cosmic Beacons

Sun cutaway

Star Color and Energy

The diagram shows the largest and smallest stars to scale.

Colorful Dwarfs

Exploding Stars

Black Holes

Exoplanets

Rings encircle a young planet in this artist's concept.

Exoplanets

An artist's concept of a giant planet orbiting a star other than the Sun.

Signs of Life

Artist's concept of a possible Neptune-mass planet orbiting Rho 1 Cancri.

Finding Earth-Like Planets

Galaxies

Nurseries of bright young stars glow red in this detailed image.

Galaxies: Cities of Stars

Types of Galaxies

What looks like the glowing eyes of an angry cybernetic owl in this Hubble Space

Galaxy Formation

The Sun and our solar system lie in the "thin disk" of our galaxy.

The Milky Way

Close up of Andromeda galaxy.

The Local Group

Galaxies Fade

Cosmology

Cosmology

The Whole Universe

Tiny variations in the "afterglow" of the Big Bang are shown as different colors

Age of the Universe

In galaxy cluster CL0024+1654, each yellow dot is a galaxy.

Dark Matter

The universe seems to be pervaded with a previously unknown, and still unexplain

Dark Energy

Tools of the Trade

Energy: Tools of the Trade

Astronomers and Observatories

Fun Facts

Phenomena, Myths and Fallacies

Astronomical Firsts

NASAThe Astro Guides for the Solar System and Beyond the Solar System are supported by the National Aeronautics and Space Administration under Grant Nos. NNG04G131G and NAG5-13147 respectively.