meteorites on earth that fell from space. all the ingredients are there. what spark is necessary? spark is a loose word there to go from inanimate organic molecules to self replicating objects. a near neighbor to have the right ingredients is high expectations for there to be life in many, many places. certainly across the galaxy. what is your sense now speaking of mars as to when humans can get there? yeah. that s complicated. dare i say i wrote a book on this. mars is expensive and dangerous and generally just the urge to want to do something that s