A note from someone on a discussion group I frequent

BTW I was talking to a Christian astronomer on Thursday. Curiously, even those scientists who believe that Nature is "the whole show" are in a quandary at the moment on the subject of "Dark matter" and "dark energy". Many scientists firmly believe these exist. They hypothesize the "dark" stuff from its "effects", but have no idea what it is and hence how to detect it (huh? methinks, how can they be sure that they are observing dark matter/energy's "effects" then?)