I did ponder that years ago.
Curious that it took so long for them to figure it out.
The comet theory always struck me as lazy.
This is news? I learned the oceans were formed this way 40 years ago in geology class.
No wonder I’m always pissing and having backaches: my kidneys are full of magma and hydrogen.
I’ll take it’s a guess Alex for 50
The problem for most planets is not producing water but keeping it from disappearing after being produced
Again our planet is a miracle
Another great thread!
The theory that Earth’s water came from asteroids and comets seems to have originated from a collection of politically liberal scientists. James Hansen was a planetary atmosphere expert before he became a climate change nut. They push this water-from-comets idea to promote their precious panspermia, that life came from comets. They are Darwinists and Atheists. They don’t believe in God and reject the overwhelming evidence for intelligent design.
The evidence is clear that our oceans are primordial, outgassed from volcanoes as the Earth cooled. Earth’s early atmosphere was mostly carbon dioxide, nitrogen and water vapor, a lot of water vapor (~100 bars). When Earth’s atmosphere cooled to saturation vapor pressure, all of that water in vapor form rained out to form the oceans.
Natural gas (CH4) is also primordial, it was here from the beginning. Large caches of natural gas formed as the Earth cooled. Natural gas hydrates are found at the bottom of the oceans, on the moons of Jupiter and Saturn, even detected on exoplanets.
That is of significant significance! A game changer, for sure.
So to colonize the Moon and Mars all that is needed is hydrogen to react with the oxides in the soil.
Water from Magma and comets are both valid theories and probably correct. What is in doubt is what percentage did each contribute.