I believe its because Asteroids typically cluster together and this creates "gaps" on the sky, but don't quote me on this.
asteroid belt
There are several rocks trapped in the orbit of the Sun. They are ;- The four rocky planets , Mercury, Venus, Earth, Mars. Then there is the Asteroid Belt between Mars and Jupiter. These are 'lumps' of rock moving in an orbital belt about the Sun. One of these rocks can be identified as 'Ceres'.
asteroid
Not much. Earth is at 1 AU, by definition, and Mars is at about 1.5 AU. Between Mars and Jupiter (about 5 AU) there are no large planets; it is thought that Jupiter's gravity interfered with planets forming near it. Instead, there are billions of asteroids, which are of similar chemical makeup to the inner planets (i.e. mostly rocks and metals), but much smaller, ranging from smaller than a sand grain to the size of U.S. states. We have observed several thousand of the larger ones; these are irregularly-shaped rocky things the size of cities. The largest, Ceres, is almost 600 miles across and orbits between 2.54 and 2.98 AU. So, I suppose I could say that Ceres is at 3 AU, once every 4.5 (Earth) years. See http://en.wikipedia.org/wiki/Ceres_(dwarf_planet) for more about Ceres.
The 'space race' refers to the competition mostly in the 1950's and 1960's between the United States and china
The asteroid belt is what is between the orbits of Mars and Jupiter.
The asteroid belt.
asteroid belt
There is a rather large asteroid belt between Mars (the last inner planet) and Jupiter (the closest outer planet.) Mostly, however, the terminology refers to the vast difference in orbit radius between the inner and outer planets.
The inner system refers to all planets in our solar system between the sun and the asteroid. The planets are in this order mercury, venus, earth, and mars. The outer solar system is the planets after the asteroid belt like Jupiter, Saturn, uranus, neptune, and Pluto.
Solar refers to a sun. Jupiter is not a sun. It is a planet, surrounded by moons.
There are several rocks trapped in the orbit of the Sun. They are ;- The four rocky planets , Mercury, Venus, Earth, Mars. Then there is the Asteroid Belt between Mars and Jupiter. These are 'lumps' of rock moving in an orbital belt about the Sun. One of these rocks can be identified as 'Ceres'.
asteroid
It is the asteroid that hit the Earth 65 million years ago and contributed to the extinction of the dinosaurs. It impact crater is located in Chicxulub which is in the Yucatan peninsula, it is buried deep underground. KT refers to the geological transition between the Cretaceous and the Tertiary periods. (Cretaceous in German starts with a K)
It is the asteroid that hit the Earth 65 million years ago and contributed to the extinction of the dinosaurs. It impact crater is located in Chicxulub which is in the Yucatan peninsula, it is buried deep underground. KT refers to the geological transition between the Cretaceous and the Tertiary periods. (Cretaceous in German starts with a K)
asteroid
An Earth-sized storm on Jupiter.