Michael Collins, the man who stayed behind aboard the Apollo 11 command module while crewmates Neil Armstrong and Buzz Aldrin descended to the moon and walked into history, has passed away after a battle with cancer, his family announced Wednesday. He was 90.

Another countdown for United Launch Alliance’s next Delta 4-Heavy rocket mission ended without a liftoff Wednesday after a computer sequencer detected a potential problem just before engine ignition.

A solid-fueled Minotaur 4 rocket lifted off early Saturday from Cape Canaveral with a U.S. military payload designed to monitor satellite traffic in geosynchronous orbit.