Oscar Monnig used to pay anyone who brought him a meteorite. This week, the new Monnig Meteorite Gallery opens on the campus of Texas Christian University. The museum showcases decades of work by the Fort Worth businessman, who died in 1999. There is one meteorite from the moon, and three from Mars. Also, a basketball-sized chunk of the rock that blasted Meteor Crater in northern Arizona. And a piece of the meteorite that crumpled a car’s trunk in Peekskill, N.Y., in 1992.