Do many astronomers believe that Mars USE to have humans and they migrated to Earth?
Wouldn’t like to say when it comes to the Mars stuff – there’s probably a few astronomers out there who believe in that sort of thing, but the vast majority don’t. As for the sealife – yes, sealife has existed on Earth for much, much longer than humans. Homo sapiens has been around for about 200,000 years. We have discovered fossils of sealife dating back many hundreds of millions of years. In fact, the earliest known fossils, those of stromatolites, formed in shallow seas. These have been dated to as far back as 2.7 billion years ago with evidence that some may date to 3.5 billion years ago. Put into figures, that’s 3,500,000,000 years for sealife, 200,000 for humans. In other words, sealife has been here for 17,500 times as long as humans have. (Incidentally, stromatolites can still be found today in saltwater lagoons and brackish lakes. They’ll probably still be here a very long time after we’re gone, too.) The earliest known whale fossils, Basilosaurids (“saurids” because they were
