Before you call the contractor and start picking out float toys, letâs make sure you know what youâre getting into. The average in-ground swimming pool costs $21,919, according to home improvement site Fixr. And thatâs for a pretty basic 32â by 16â model. But thatâs just to build the thing. Then you have to take care of it.
The large majority of known asteroids orbit in the asteroid belt between the orbits of Mars and Jupiter, or are co-orbital with Jupiter (the Jupiter trojans). However, other orbital families exist with significant populations, including the near-Earth objects.
Asteroid History. Several hundred thousand asteroids have been discovered and given provisional designations so far. Thousands more are discovered each year. There are undoubtedly hundreds of thousands more that are too small to be seen from the Earth. There are 26 known asteroids larger than 200 km in diameter. Our census of the largest ones is now fairly complete: we probably know 99% of the asteroids larger than 100 km in diameter. Of those in the 10 to 100 km range we have cataloged about half.