About the same age as the time of formation of the solar system: 4.6 billion years to 4.7 billion years.
They are concentrated between the Mars and Jupiter.
Scientists may not have named all of the asteroids in the asteroid belt because there are so many that they are hard to keep track of.
Because they have been observed and space probes have navigated through them.
At the same time that the Earth (and the other planets) formed : 4.5 billion years ago.
with computers and devices
It doesn't seem that scientists are anywhere near to knowing the total number of asteroids in the Kuiper belt.
Absolutely nothing.
Scientists think that the asteroid belt is a group of planetesimals (solid objects) that are caught between the gravity of Jupiter and the Sun.
they beleive it to be from 45 million years old
there are so many, scientists don't know.
In the old days they did believe that they were distant suns because of the fact of how big it was.
A) Some scientists suppose that the asteroids represent pieces of a planet that once existed but was torn apart a long time ago. B) Other scientists believe that the asteroids are material that never came together to form a planet in the first place.