The Asteroid Belt

The asteroid belt sounds crowded and is almost entirely empty — spacecraft fly straight through and never see a thing! If you gathered every rock in it together, it would still be smaller than our Moon.

🚀 Travel there

What it is

Wide ring of leftover rocky rubble between Mars and Jupiter; mostly empty space.

Belt of small bodies: Whole populations of small bodies, not single objects. Every kind of thing there is →

Can you see it?

Not as one thing, no — the Asteroid Belt is a place rather than a sight, and you are already inside it. What you go out and look at are the things in it, one at a time.

Worth knowing about the Asteroid Belt

What it is made of: Millions of rocky and metallic chunks, from tiny pebbles up to the dwarf planet Ceres.
How it moves: Most main belt asteroids take 3 to 6 years to orbit the Sun once.
The machines we sent: NASA's Dawn spacecraft visited Vesta and dwarf planet Ceres, 2011-2018.
What makes it worth knowing: Even though movies show it as super crowded, spacecraft usually fly through without seeing a single asteroid up close — it's mostly empty space!

The numbers

Distance from the Sun, on average	roughly 2.2 to 3.2 AU from the Sun

What it belongs to

☀️ Everything the Sun holds, in one place 📖 How the solar system fits together

Then go outside

Too big to look at all at once — but the things inside it are not. The Planetarium will show you which are up.

🌙 Plan an evening outside 🌌 Everything else in the sky