The major problem—one of the major problems, for there are several—one of the many major problems with the panspermia argument is that space is a very unfriendl

The major problem—one of the major problems, for there are several—one of the many major problems with the panspermia argument is that space is a very unfriendly place for anything living to reside. Okay, it might be that conditions on Earth were harsh at times, but that by far doesn't seem to match those found in space. At geological time scales, space just doesn't appear very safe for life.