Lack of evidence doesn't automatically qualify a claim as extraordinary. For a long time we didn't have any evidence of craters on the other side of...
The problem with that is that it's not always easy to determine whether the technical ability is there or not, "ability" being a fundamentally modal...
Comets are of great importance to astrobiology, whether there is active chemistry or not. The reason is that ice is a very good preserver of complex...