Science Channel has ordered a third season of “Meteorite Men.”Produced by the LMNO Cable Group, skein follows co-hosts Geoff Notkin and Steve Arnold as they search for outer space objects, some more than 40 million years old, that have landed on Earth. Eric Schotz is exec producer. Discovery-owned Science Channel is faring well with “An Idiot Abroad,” its new skein with Ricky Gervais, Stephen Merchant and Karl Pilkington. Through two episodes, “Idiot” — in which Pilkington offers his off-kilter take on the seven wonders of the world — is the net’s most-watched series ever in the 25-54 demo and highest rated in 18-49. Since its Jan. 22 premiere, 4.3 million viewers have tuned in.