"palsing" wrote in message
...

https://www.jpl.nasa.gov/news/news.p...ily-20190523-2

"The mystery of why Earth has so much water, allowing our "blue marble" to
support an astounding array of life, is clearer with new research into
comets. Comets are like snowballs of rock, dust, ice, and other frozen
chemicals that vaporize as they get closer to the Sun, producing the tails
seen in images. A new study reveals that the water in many comets may share
a common origin with Earth's oceans, reinforcing the idea that comets played
a key role in bringing water to our planet billions of years ago."


*** Oh boy, Palsing, you're a real crackerjack when it comes to Astronomy.
The Oort Cloud is populated almost entirely by icy objects. Every now and
then one gets bumped from it orbit and does indeed become a comet and the
ice is gradually turned into vapor as it approaches the Sun. BTW, that's
how Mercury, Venus and Mars got their water. Mercury's was vaporized by its
proximity to old Sol, Venus is shrouded partially by its steam and Mars lost
its water due to some cataclysmic event that exposed its surface to the Sun
and its surface water evaporated.
If you have any more questions, just ask.