“I don’t think they’ll ever be back,” Glenn said of the space shuttle program.
“I’m pretty sure they’re not going to go to Mars.
The only way to do that is to do a big bang, and we haven’t done that.”
Glenn was in a conversation with NASA Administrator Charles Bolden at the Kennedy Space Center about the shuttle’s retirement, but was not allowed to answer any questions from the media.
“I don�t want to get into too much detail about what happened at the end of the shuttle,” Glenn told ABC News.
“The only thing I can tell you is that the program was a disaster and that we’ve been through this before.”
The U.S. has spent more than $400 billion on spaceflight since the shuttle program ended in 2011, with an estimated $200 billion spent since the program ended.
The United States has been the only nation in the world to launch a manned mission into space since 1998.
The last flight of the Space Shuttle Endeavour was on July 16, 2020, and the next two are scheduled to take place in 2021 and 2024.
The last flight to orbit the Earth was in 2009, and that mission is scheduled for a re-entry on Oct. 6, 2021.
NASA plans to use a robotic craft to bring down the Space Launch System rocket from its launch pad at Vandenberg Air Force Base, California.
The last launch of the Orion spacecraft was in 2016, and NASA plans on having astronauts in orbit for a decade or more, although the space agency is currently working on an upgraded version of the capsule.