Green Lantern

I was reading CR and MJ a Super friends book this afternoon. The page was talking about the Green Lantern, who's super power is that he protects the world from the dangers from outer space. MJ stops me and says "Why didn't he save the dinosaurs from that thing that came from outer space and made all the dinosaurs die"? Damn he is smart. Yes, it was called a meteor, and well...I am not sure if the Green Lantern was around that many thousands of years ago.