i din't think so but sometimes comets are
A cloud of hydrogen gas which has the potential of fusing and creating energy in the form of heat or light - or stars.
molecular hydrogen H2
Atomic number is the equivalent of the number of protons in an atomic nucleus.
The condensing substance of cloud is typically water vapor, which forms small droplets or ice crystals, typically 0.01 mm in diameter. When surrounded by billions of other droplets or crystals they become visible as clouds.
mostly hydrogen and helium
yes sometimes
No
No. A comet is surrounded by various vaporized ices, but not hydrogen.
Asteroids
Comets are believed to have originated from asteroids in a sort of 'cloud', called the 'Oort Cloud'. It is thought all comets come from the Oort Cloud, which is a cloud of asteroids beyond the Kuiper Belt beyond Neptune. When one asteroid is knocked off from its orbit from the Oort Cloud, it makes really long trips around the Sun, which is why it becomes a comet. All of the asteroids in the Oort Cloud have some type of ice on them, since they are so far away from the sun that everything in the Oort Cloud seems to freeze.
hydrogen
A cloud of hydrogen gas which has the potential of fusing and creating energy in the form of heat or light - or stars.
Water.
A gas cloud (of mostly hydrogen).
The Kuiper belt is composed of asteroids and the Orrt cloud is composed of comets.
They bring down rare minerals and potentially hydrogen and water
protogalactic cloud