Sentences with phrase «cometary bombardment»

However, if this star is as young as chromospheric activity alone would suggest, then it is likely that only primitive organisms like bacteria that can survive heavy meteorite or cometary bombardment would be likely to survive on any Earth - type planet that has cooled sufficiently to allow carbon - based lifeforms to develop.

In any case, any developing carbon - based life on a developing Earth - type planet would be subject to tremendous heat on a newly formed planet that is under intense asteroidal and cometary bombardment, in addition to the intense and deadly radiation produced by nearby supernovae and other massive young stars.

This is because of the immense number of circumstantial «accidents» over billions of years that form our particular path to consciousness (including, perhaps, periodic cometary bombardment of the earth and resulting extinctions).

Not exact matches

Diminishment of cometary and meteoric bombardment allowed anaerobic microbes to spread widely in wet habitats.