Quote:
Originally Posted by Paul Markham
Got anything scientific you can link to, to show you have a clue what you're talking about?  |
Actually, water coming from comets isn't the accepted reason for our water anymore. However water is not special to our planet. Water is Hydrogen and Oxygen - two of the elements that exist. The elements are specific atoms that make up matter in our world. These elements were created in the big bang (whatever that might have been is still up for debate). Everything we know and see is made up of these atoms / elements. So water is not specific to our planet, there just happens to be a lot here - just as other planets might be made up of a majority of another element. Comets that crash into our planet that came from far far away are usually made up of mostly iron (another element). It's likely that we don't know of all the elements that exist, as there might be some extremely rare ones floating around our planet or universe not yet discovered - however it's not certain that they exist either.
We don't know for sure why Earth has a lot of water on the surface, but it's not specific to earth. We know of plenty of planets that have water or ice on them. Planets are just made up of elements, some elements more than others. Each one is it's own mixture of elements. Ours happens to be a mixture containing lots of water.