yes they do streak
Yes, comets can have a bright streak of light called a tail when they pass close to the sun. This tail is formed by gas and dust particles being heated by the sun, which then reflect sunlight and appear as a streak of light in the sky.
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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).
Comets can vary in visibility depending on their size and proximity to Earth. Some comets can be easily seen with the naked eye when they pass close to our planet, while others require binoculars or telescopes to observe. So, it can be easy or hard to see a comet depending on these factors.
Yes they do, they are both rocks from outer-space. They both have a nucleus and they both travel in space. The thing that comets and meteors have in common is that they all travel in space and most of them all have not changed because of their formation in the solar nebula.
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.
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. Comets do not enter the atmosphere of the earth (we hope!). What you see is gasses that are released from the comet, illuminated by the sun. However, a meteor (shooting star) is visible only due to the atmosphere heating the meteor.