5.2billion sq feet in diameter
Scientists believe that most comets come from the Oort Cloud, a vast region of space far beyond the planets. According to this theory, the left-over remnants of the solar system, stuff that never...
Long period comet
These days, pretty close to about 10 degrees Kelvin, which is cold enough to freeze any gas except helium and possibly hydrogen.
Alan Hale and Thomas Bopp.