It is not going to end civilization. Impact is in general a rare event. As such, they are popularly described as "dirty snowballs" after Fred Whipple's model. This is because the trajectories need to be finely tuned. What if it kept moving towards us? Nobody knows for certain. In order to understand meteorite impacts on Earth, it is important to know where the chunks of rock come from. So do comets: Comet Shoemaker-Levy 9 hit Jupiter in 1994.

Fortunately, there are not many large objects with unknown orbits left in the Solar System, so such collisions are pretty rare. However, many comets have a higher dust content, leading them to be called "icy dirtballs".

Asked in The Moon , Astronomy , Comets Can a comet hit earth … Answer 2: Collisions of asteroids and especially comets are very, very rare. As such, they are popularly described as "dirty snowballs" after Fred Whipple's model. (The Chelyabinsk object, by contrast, probably hit Earth's atmosphere at about 40,000 mph, or 64,000 km/h.)

However, many comets have a higher dust content, leading them to be called "icy dirtballs". Can an asteroid hit Earth? Cometary nuclei are composed of an amalgamation of rock, dust, water ice, and frozen carbon dioxide, carbon monoxide, methane, and ammonia. While the vast majority of such objects are not on a path to collide with our own planet, some occasionally are. A comet that hits the Earth would be as destructive as many nuclear bombs, depending on how big it was and where it hit. Would we suffer the same fate as the dinosaurs? Earth could be at higher risk of being hit by a comet than widely thought, according to astronomers who have suggested keeping a closer eye on distant objects. Outer Space is full of potentially dangerous objects - objects such as asteroids, comets, meteoroids, and even man-made satellites that pose a risk to our planet. Outer Space is full of potentially dangerous objects - objects such as asteroids, comets, meteoroids, and even man-made satellites that pose a risk to our planet. It is possible that an asteroid may hit Earth one day, but the chances of this happening are very small. Meteoroids are rocky remnants of a comet or asteroid that travel in But a conspiracy theorist says Nasa is lying and instead it will hit our planet Last year Nasa detected an object, that could be a comet or an asteroid, on a path towards Earth.

However, some are in orbits which can take them closer to Earth. But sometimes comets get a passport to a more tropical climate, to the warm inner solar system enjoyed by Earth…

Comets might typically explode in Earth's atmosphere instead of striking the ground, because they possess large amounts of structurally weak ice. A comet that does not hit the Earth would cause no damage at all. (The Chelyabinsk object, by contrast, probably hit Earth's atmosphere at about 40,000 mph, or 64,000 km/h.) While the vast majority of such objects are not on a path to collide with our own planet, some occasionally are.