By Anne Ready LOS ANGELES – “Dinosaurs are extinct today because they lacked opposable thumbs and the brainpower to build a space program,” quipped Neil deGrasse Tyson, astrophysicist and author of The Sky is Not the Limit. Addressing SpaceX CEO Elon Musk and his crew, Dr. Tyson tweeted: “Good luck to @elonmusk and the @SpacexXcrew. “Though it’s rocket science, rocket launches can …