12 Asteroid Belt Facts | Location, Distance & More

The Asteroid belt is one of the most interesting parts of our solar system, so it makes sense why so many of us are truly fascinated with it. Of course, the reason why we call it the Asteroid belt is because it’s full of asteroids. We also refer to the Asteroid belt and the main Asteroid belt, or sometimes just as the Main belt. 

But with so much out there and millions of asteroids, things can get a little bit confusing. So to help, I’ve listed some of the most interesting facts about asteroids, as well as answering some common questions. Let’s begin!

Asteroid Belt Facts

  1. It’s estimated that there is anywhere between 1.1 million and 1.9 million asteroids in the Asteroid belt that are more than one kilometre in diameter. There are many millions more of asteroids that are smaller than this.
  2. The Asteroid belt is more than 329,000,000 miles in length, which is approximately 480,000,000 kilometres.
  3. With all this space in the Asteroid belt, this means that many of the Asteroids are far away from each other. There’s an approximate 600,000 miles between each asteroid, on average.
  4. It was once said that all of the asteroids in the Asteroid belt were actually part of a planet, which used to exist. However,
  5. Most asteroids are made up of rock and metal. Some of the most common metals that asteroids are made up of are iron and nickel.
  6. The smallest asteroid that has ever been recorded by astronomers was only a few meters in diameter, so it was actually quite small!
  7. On the other hand, the largest asteroid in the Asteroid belt is the dwarf planet, Ceres.
  8. Ceres was actually the first Asteroid to be discovered in the Asteroid belt, all the way back in 1801. Less than 15 months later, another asteroid was seen within the same region.
  9. Ceres is still the biggest Asteroid that we have found out in the Asteroid belt.
  10. The Asteroid belt is essentially full of the leftovers that couldn’t form into a planet more than 4.6 billion years ago.
  11. The total mass of all the Asteroids out in the Asteroid belt don’t even equal 4% of the total mass of the moon, which is why we don’t think it could be the remains of a planet.
  12. A total of half of the mass in the Asteroid belt is made up of just 4 asteroids; Ceres, Vesta, Pallas and Hygiea.

Where is the Asteroid belt situated?

The Asteroid belt is located between Mars and Jupiter. It is more than two and a half times the distance as the Earth is from the Sun, making it between 205 and 297 million miles (2.2 AU to 3.2 AU from the Sun itself, being approximately 93 million miles thick (1 AU). It is filled with millions of asteroids, making it the subject of great curiosity. 

As you can see, the Asteroid belt follows the same donut shaped pattern as the Kuiper belt – it’s essentially a large ring around the Sun. These asteroids also orbit around the Sun, like Earth. Unlike planets, Asteroids do not strictly have the same naming restrictions that we have with planets and larger discoveries – in fact, you can check out the entire catalog of asteroid names!

Where the outer solar system is concerned, things are a little different than what you may find down in the inner asteroid belt. The Kuiper belt objects are much colder than those in the Asteroid belt though, as frozen comets and large rocky objects get pulled from the outer regions into the Sun due to gravity.

Asteroid Belt – Commonly Asked Questions

How did the Asteroid belt originate?

Originally, many astronomers thought that the Asteroid belt was actually the remains of a planet that had collided with another object. However, nowadays this theory isn’t thought to be true, because of the low overall mass of the Asteroid belt. The Asteroid belt is essentially stuck in limbo, as it cannot bring itself together to form a planet due to the gravity from Jupiter.

Which dwarf planet is in the Asteroid belt?

Currently, there is only one official dwarf planet in the Asteroid belt, which is Ceres. It’s significantly larger than any of the other objects in the belt, and it was actually the first object in it noticed when the Asteroid belt was discovered back in the early 1800s. The other dwarf planets that we know exist are all located in the Kuiper belt, which is further out past Neptune.

Is there more than one Asteroid belt?

There is undoubtedly more than one Asteroid belt out there in one of the other Solar Systems, with there being more than 500 that we know of. There is the potential for there to be billions of different solar systems out there, which means that there could also be billions of Asteroid belts too.

Can you see the Asteroid belt with a telescope?

How do you think Italian astronomer Giuseppe Piazzi found Ceres in the first place – with a telescope! However, it is very far away and it would be very difficult to identify it.

How does the Asteroid belt stay in place?

The asteroids that are out there in the Asteroid belt are relatively small in mass. They are essentially stuck between the gravity of the Sun, which pushes them outwards, and Jupiter, which keeps them in position between the two.


The Asteroid belt is another important discovery in our Solar System, and it’s one of the most intriguing things too. Although many films depict asteroids to be in close quarters of each other, the Asteroid belt itself is actually very sparse, with large gaps between different asteroids. 

If you have any questions about the Asteroid belt, then please feel free to get in touch and I’ll do what I can to help you out!