PermeateFree said:
>>The Earth as a habitable planet may be rarer than we thought. Scientists have used computer models to show that the reason our planet and has a moderate climate and isn’t an ocean world is because there was a massive star in the vicinity of the primordial solar system. This star provided the growing inner planets with radioactive elements that evaporated some of the water that otherwise would have been delivered to them.<<
https://newatlas.com/primordial-star-key-life-earth/58428/
What the hell. The newatlas article makes no sense at all. Looking up the original technical article to see if that makes more sense.
“A water budget dichotomy of rocky protoplanets from 26Al-heating”.
“The heat generated by 26Al rapidly dehydrates planetesimals before their accretion onto larger protoplanets”.
OK so far. That’s a fair explanation of why Ceres doesn’t have an atmosphere. Although the other more likely option is the heat generated by planetesimal collisions.
“Qualitatively, our models suggest two main scenarios for the formation of planetary systems: high-26Al systems, like our Solar System, form small, water-depleted planets, whereas those devoid of 26Al predominantly form ocean worlds.”
I can live with that.
The 26Al comes from the supernova that generated the shock wave that compressed the pre-solar nebula enough for it to collapse under its own gravity – of course.