Re: Planet around Alpha Centauri - lets talk about it
In our system, the Sun's heat burned off all the water in the inner system, and it was bombardment by comets from further out that restored water to the Earth.
Total speculation. There are many hypotheses of Solar system formation, and most have serious problems. The nebular hypothesis is especially weak, with conservation of angular momentum one of its bigger problems. And since several comet missions have observed comets close up as bone-dry rocks with little or no volatiles, the idea of comets giving Earth its oceans (or using comets to Terraform Mars) is untenable.
The alleged Oort cloud is also utter speculation.
"No, I better not look. I just might be in there."
—Foghorn Leghorn, Little Boy Boo