Scientist try to figure out how life originated on earth. I think this is wrong-headed. It is not as though earth sits in a vacuum bottle. Material from all over the solar system pummels it every day. It would make more sense to also study how life could have arrived on any of that material. Allowing for that possibility greatly expands the field of study to well outside the solar system to find the initial sparks of life. Bits of it could well have come about in widely separated parts of the universe under vastly different conditions.
~ Roedy (born: 1948-02-04 age: 64)