steroids are celestial bodies that orbit the Sun and that are too small to be considered planets. They are concentrated between Mars and Jupiter.
Asteroids are bodies celestial metal forming orbiting sun . They are not classified as planets because they are not large enough to do so. Most asteroids are concentrated between the orbits of Mars and Jupiter , a region called the asteroid belt.
How were asteroids formed?
Everything we know about these celestial bodies comes from analyzes of those who fell to Earth. The chemical elements that usually form asteroids are silicate, iron and nickel .
Asteroids may be the remains of a planet that has been destroyed or simply materials that, since the formation of the Solar System , have never fused to form a planet. This second hypothesis is the most accepted to explain the origin of these celestial bodies.
Don’t stop now … There’s more after the publicity;)
Bennu is an asteroid about 0.5 km in diameter that travels at a speed of 101,389 km / h. It has been known to astronomers since 1999. There is a 0.04% chance that this asteroid will hit Earth in 2135.
The NASA , the American space agency, launched in 2016 to Osiris-REx spacecraft, which will travel to the asteroid Bennu, reaching its surface in 2018. The purpose of this space mission is the probe returns to Earth in 2023 bringing asteroid samples. These samples can contain important information regarding the formation of the Solar System .
If all known asteroids were joined into a single body, the result would be an object with a diameter of approximately 1500 km, less than half the diameter of the Moon.