It is aproximitaly40 km in diameter
It was discovered by Alan Hale and Thomas Bopp in 1995.
Halley's comet - which returns to our solar system approximately every 75 years - is one example, named after it's discoverer Edmund Halley. Another notable example is Shoemaker-Levy 9. It was observed orbiting the planet Jupiter, but the orbit was decaying - leading to the prediction that it was to crash into Jupiter's surface.
The comet's size changes depending on how close it is to the sun and the location. There's no real set size range.
A comet be able to be of sun size.
By themselves, comets are not really important. Even the most impressive comet, like Hale-Bopp, is a visual spectacle only. But the POTENTIAL for a comet - to strike the Earth directly and cause untold devastation - is far more significant. Right now, if we were to see a comet aimed at the Earth, there is very little that we could do about it, other than stand there and die. The threat of a comet impact, like the ones that have devastated our planet several times before, ought to be enough spur us all into looking for ways to protect ourselves from the inevitable time that it WILL happen again.
big
The comet west is estimated to be about 37 miles in diameter.
Depends on the comet. Size varies. But they are usually smaller.
actually a comet will make a bigger tsunami than an earth quake because it depends on how big the comet is so obviously if its a mini comet about the size of a fist its not going to do any affect but a comet like the size of Texas it would make a Mega Tsunami and once there was a Mega Tsunami the size of a city! and it flooded it completely.
It varies- it entirely depends upon the size of the comet, they are all different and there's no standard size for them. They can be as little as about 100 feet across, whilst the big ones can have a diameter of a couple of miles.
1 - Halley's 2 - Lovejoy 3 - Hale-Bopp 4 - Ison 5 - Shoemaker-Levy 9 Note: Obviously that's a matter of opinion to some extent. I would have a different list. See "related link" below for a list of some famous comets. Note: Unfortunately, the photo and caption for the "eclipse comet of 1948" is wrong in this link.
About the size of Texas.