When people argue the possibility of life on other planets one of the contentions is that it is hard to imagine life outside of earth because we understand that other planets do not have our atmosphere. We know that Mercury, for example, is much hotter than Earth, so humans couldn’t live there. We know that Neptune is just the opposite, so far from the sun that it would be immensely cold. But, additionally, we breathe oxygen and, as we far as we know, this is the only planet that has an ozone layer appropriate for oxygen-based life forms.
But new research investigates the possibility that other forms of life could exist on other planets if, for example, they could survive on a different type of atmosphere. Like the methane-based atmosphere of Saturn’s moon Titan, for example.