Some streams come from asteroids. Some asteroids are thought to be debris left over from the formation of the solar system. Early on, the birth of Jupiter prevented any planetary bodies from forming in the gap between Mars and Jupiter, causing the small objects that were there to collide with each other and fragment into the asteroids seen today. Others are believed to be fragments from a collision of large asteroids or protoplanets. Comets and asteroids are objects in orbit around the sun leftover from the formation of the solar system. Asked … But many have been nudged out due to collisions or gravitational interactions over the last few billion years. Earth doesn't always intersect all the meteoroid streams in its region, but there are around 21 or so streams it does encounter. For example, some asteroids are found in the orbital path of planets. Why Do Comets Come Back, Instead of Veering Off Into Space? Asteroids are rocky objects primarily found in the asteroid belt, a region of the solar system that lies more than 2 ½ times as far from the Sun as Earth does, between the orbits of Mars and Jupiter.These objects are sometimes called minor planets or planetoids. A planetary nebula. They're just the left over bits. Most are out in the space between Mars and Jupiter. Earth and a few other planets have asteroids like this. Asteroids hang out in other places, too. Most asteroids that nearly hit us are only a few dozen feet across. As of 2018, a study was released from researchers at the University of Florida that found the asteroid belt was created from the remnants of … Mission scientists are hoping to gain some insight into how to deflect it if it should threaten to collide with the Earth. Where Do They Come From? Short period Comets orbit in the Kuiper Belt out to a distance of about 120 AU. This means that the asteroid and the planet follow the same path around the sun. Most of them are grouped in the main belt, but that is not the only asteroid field in the solar system. The origin of comets and asteroids is not completely understood. Asteroids, not comets, may have delivered most of Earth's water to the planet when the solar system was young, new data from a probe orbiting a comet suggests. Long period Comets orbit in a sphere beyond the Kuiper Belt called the Oort Cloud, up to a distance of about 2.4 Light Years distant. Asteroids and comets are considered remnants from the giant cloud of gas and dust that condensed to create the sun, planets, and moons some 4.5 billion years ago. Asteroids orbit mostly in the Asteroid Belt. Asteroids are formed from the leftovers of the formation of our solar system from about 4.6 billion years ago. The asteroid family that produced the dinosaur-killing asteroid remains at large. Further, the significant chemical differences between the asteroids become difficult to explain if they come from the same planet. This is Asteroid 243 Ida. They "come from" the same place as everything else in this solar system. Its orbit crosses the Earth’s orbit, and it will come close to the Earth—a few times the Moon’s distance—several times during the rest of this century.