Ratburn's been shown to occasionally be out of the loop of somethings - particularly today's technology . . . but there's no way that he, as the toughest third grade teacher at Lakewood Elementary, shouldn't know what a meteorite is.
And Brain, like Arthur, has always had perhaps the most inconsistent changes in voice actors - they had a decent Arthur when these Flash seasons started, but there was something about his inflections that made him sound more like Brain than Arthur . . . then as of last year, the current voice of Arthur makes Arthur sound too girly.