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Asteroid orbits continue to be appreciably perturbed whenever their period of revolution about the Sun forms an orbital resonance with Jupiter. Some fragments eventually found their way into the inner Solar System, leading to meteorite impacts with the inner planets. As a result, 99.9% of the asteroid belt's original mass was lost in the first 100 million years of the Solar System's history. Collisions became too violent, and instead of fusing together, the planetesimals and most of the protoplanets shattered. Between Mars and Jupiter, however, gravitational perturbations from Jupiter imbued the protoplanets with too much orbital energy for them to accrete into a planet. Planetesimals are the smaller precursors of the protoplanets. The asteroid belt formed from the primordial solar nebula as a group of planetesimals. Individual asteroids within the asteroid belt are categorized by their spectra, with most falling into three basic groups: carbonaceous ( C-type), silicate ( S-type), and metal-rich ( M-type). Nonetheless, collisions between large asteroids occur and can produce an asteroid family, whose members have similar orbital characteristics and compositions. The asteroid material is so thinly distributed that numerous unmanned spacecraft have traversed it without incident. The remaining bodies range down to the size of a dust particle. The total mass of the asteroid belt is about 4% that of the Moon.Ĭeres, the only object in the asteroid belt large enough to be a dwarf planet, is about 950 km in diameter, whereas Vesta, Pallas, and Hygiea have mean diameters less than 600 km. About half its mass is contained in the four largest asteroids: Ceres, Vesta, Pallas, and Hygiea. The asteroid belt is the smallest and innermost known circumstellar disc in the Solar System. This asteroid belt is also called the main asteroid belt or main belt to distinguish it from other asteroid populations in the Solar System such as near-Earth asteroids and trojan asteroids. It contains a great many solid, irregularly shaped bodies, of many sizes, but much smaller than planets, called asteroids or minor planets. The asteroid belt is a torus-shaped region in the Solar System, located roughly between the orbits of the planets Jupiter and Mars. The total mass of the asteroid belt is significantly less than Pluto's, and roughly twice that of Pluto's moon Charon. Star Walk is one of the most complete apps that you will find and, moreover, you will see that the images are some of the highest quality that you have seen up until now.By far the largest object within the belt is the dwarf planet Ceres. You just have to write the name of what you want to see and with the arrows, Star Walk will guide you to move your phone to the point where the celestial bodies can be seen. On the other side, Star Walk will also indicate where all the stars are located or the planets that can be seen. On the other side, in Star Walk you will also have a night mode, which will allow you to use the application while sky watching. So, you do not have to go to another country to see the stars that people see at night. You just have to press on the location on the globe that is in the app to see the sky from this point and the stars that are viewed from there. With Star Walk, not only will you be able to see all the stars that are in the sky but also the stars that are over any country. It is a very complete app, which if you like the stars and astronomy, this is one of the best apps that you have available. Star Walk is an application in which you are going to be able to go through all that steps you want in the stars and in any part of the world.