Many Worlds
Our solar system has a star, eight planets, five dwarf planets, and thousands of asteroids, and comets.
Meet Me in the Orion Arm
Our solar system orbits the center of the Milky Way galaxy. We’re in one of the galaxy’s four spiral arms.
A Long Way Around
It takes our solar system about 230 million years to complete one orbit around the galactic center.
Spiraling Through Space
There are three general kinds of galaxies: elliptical, irregular, and spiral. The Milky Way is a spiral galaxy.
Room to Breathe
Our solar system has no atmosphere. But it has many worlds – including Earth – with many kinds of atmospheres.
Many Moons
Our solar system has more than 200 moons.
Ring Worlds
The four giant planets – and at least one asteroid – have rings.
Getting Out There
More than 300 robotic spacecraft have left Earth's orbit, and 24 U.S. astronauts have traveled to the Moon.
Life as We Know It
So far, Earth is the only place we've found life in our solar system, but we’re looking.
Going Interstellar
The Voyagers are the only spacecraft to reach interstellar space.
