"The Oort cloud". (Although very remote it's still part of the solar system really.)
Comets. We think. Let's be clear about this; the "Oort cloud" is entirely THEORETICAL. It makes perfect sense that there must be SOMEPLACE that comets are coming from, since it's impossible that the same comets have been swooping past the Sun for the last 4.5 BILLION years. But as of yet, we have no actual EVIDENCE of the area known as the Oort Cloud. Nor, given the distances involved, is it even possible for us to GET the evidence given our current technology. As scientists, we can be fairly confident that when we get out there, either in person or by robot, we'll find a vast area with a few billion speckles of dirt, rocks, ice - you know, comet stuff. Then we will have some evidence that the Oort cloud theory is correct. But we're not there yet.
There have been 4,000 comets that have been discovered in the solar system as of 2010. The most famous comets that have names is Hale-Bopp, Swift-Tuttle, Hyakutake, Halley and Shoemaker -Levy 9.
That's a description sometimes given to comets.
Fog
Nebulae
It is unknown as not much is known about Eris at this point. However, it is not likely that Eris has had many encounters with asteroids given its positions in the solar system. It probably, has had more thane a few encounters with comets, however.
cumulus humilis
Cloud cover is usually given as a percentage, there is no unit of measure.
It is impossible to know exactly where an electron is. Thus, the size of an electron cloud can be given only in terms of probability. Even then, the size of the electron cloud depends on how many electrons an atom possesses.
comets are given the designation reflecting the date of discovery of the comet. they were named by their discoverers with certain guidelines about what constitutes a discovery and how many discoverers may be named.
It was given to him by Zack, before he died, at the end of FFVII: Crisis Core.
There is a very big comet that passes the earth about every 76 years. It's called the Halley comet!