yes they do streak
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No. Some comets periodically pass by the Earth, such as Halley's comet, but the Sun primarily creates the path they follow. Saturn's moon, Phoebe, may have originated as a comet.
NASA's Near Earth Objects program is one group that tracks object that pass near the Earth (you might have expected that from the name).
There are hardly any comets, meteorites or asteroids near earth. There are only a few that are millions of kilometers from earth. There are a few that pass earth a bit closer because of the asteroid belt between Mars and Jupiter.
Nothing particularly dangerous, there would be an impressive display or meteors.In fact the earth does pass through the remnants of comets regularly. The Perseid and Leonid meteor showers appear every year are just such events.
No. Comets LOSE mass with each pass by the Sun.
More do then we think, but many we aren't able to see. Ones like Haley Bop you could see with a good telescope.
Although sometimes not visible from parts of the planet, comets can be seen from very large geographical areas on Earth, not only from individual locations.
There are comets around all the time. In order to have this much of a cataclysmic effect, it would need to pass very close to the earth, if not hit it entirely. At the moment, we do not know of any comets on this trajectory.
There is in Korea, but it's just because of a law.
Yes. The solar system is everything that orbits the sun.
Yes, comets pass by earth regularly and it has been hit by metorites regularly. If the Big Bang theory is correct, then an asteroid could be headed towards Earth just like our system was created