Astronomy teacher Dottie Metcalf-Lindenburger usually gives assignments, but on Monday she got one. The Hudson’s Bay High School teacher was notified that she has been selected by NASA to be an educator astronaut. The position is based at the Johnson Space Center in Houston. The National Aeronautics and Space Administration said Monday it could not confirm that she had been selected. NASA will publicly announce its next astronaut class on May 6.