Marcia Dunn

AP Aerospace Writer

A United Launch Alliance Atlas V rocket lifts off from pad 41 at the Cape Canaveral Air Force Station Thursday, July 30, 2020, in Cape Canaveral, Fla.

NASA Launches Mars Rover

The mission will look for signs of ancient life.

In this Sunday, Dec. 22, 2019 photo made available by NASA, Boeing, NASA, and U.S. Army personnel work around the Boeing Starliner spacecraft shortly after it landed in White Sands, N.M. On Tuesday, July 7, 2020, NASA officials said they have identified 80 corrective actions for safety, mostly involving software, that must be implemented before the Starliner capsule launches again. The previous count was 61.

NASA Adds Safety Fixes for Boeing's Crew Capsule

The changes follow a pair of close calls during a test flight.

In this image provided by NASA, the SpaceX Dragon crew capsule, with NASA astronauts Doug Hurley and Robert Behnken aboard, docks with the International Space Station Sunday, May 31, 2020.

SpaceX Delivers Test Pilots to Space Station

It was the first time a privately built and owned spacecraft carried astronauts to the space station.

The SpaceX Falcon 9, with the Crew Dragon spacecraft on top of the rocket, sits on Launch Pad 39-A Thursday, May 28, 2020, at Kennedy Space Center in Cape Canaveral, Fla. Wednesday's planned launch was scrubbed due to weather. They will try again to launch Saturday.

SpaceX's Second Attempt Faces More Storms

It is the company's second attempt to launch astronauts for NASA.

In this handout photo released by Roscosmos Space Agency Press Service U.S. astronaut Chris Cassidy, left, Russian cosmonauts Anatoly Ivanishin, centre, and Ivan Vagner, members of the main crew of the expedition to the International Space Station (ISS), walk prior the launch of Soyuz MS-16 space ship at the Russian leased Baikonur cosmodrome, Kazakhstan, Thursday, April 9, 2020.

Astronauts Leave Virus-Plagued Planet for Space Station

Not even family members could bid them farewell.

In this April 11, 1970 photo made available by NASA, the Saturn V rocket carrying the crew of the Apollo 13 mission to the moon launches from the Kennedy Space Center in Florida.

Remembering Apollo 13 at 50

It is regarded as NASA’s most successful failure.

In this Feb. 7, 1984 photo made available by NASA, astronaut Bruce McCandless II, performs a spacewalk a few meters away from the cabin of the Earth-orbiting space shuttle Challenger, using a nitrogen-propelled Manned Maneuvering Unit.

NASA Call for Astronauts Draws 12,000

It was NASA's second-largest group of astronaut hopefuls.

A United Launch Alliance Atlas V rocket lifts off from Cape Canaveral Air Force Station, March 26, 2020.

Space Force Launches First Mission

The new branch launched a $1 billion national security satellite.

This March 26, 1971 photo made available by NASA shows astronauts Al Worden, center, Dave Scott, left, and Jim Irwin in the Command Module for an altitude chamber test at Cape Canaveral, Fla. Worden, who circled the moon alone in 1971 while his two crewmates tried out the first lunar rover, has died at age 88, his family said Wednesday, March 18, 2020.

Apollo 15 Astronaut Al Worden Dies at 88

He circled the moon alone in 1971.

A Falcon 9 SpaceX rocket with a payload of approximately 60 satellites for SpaceX's Starlink broadband network lifts off from pad 39A at the Kennedy Space Center in Cape Canaveral, Fla., Wednesday, March 18, 2020.

SpaceX Success Despite Engine Failure

The engine failure happened shortly after liftoff on a recycled rocket flying a record five times.

In this image taken from NASA video, NASA astronauts Andrew Morgan and Jessica Meir use the International Space Station's robot arm to capture the Dragon capsule Monday, March 9, 2020.

SpaceX's 20th Station Shipment Brings Candy, Science

Skittles, Reese's Pieces, Hot Tamales, and science.

In this Dec. 22, 2019 file photo, the Boeing CST-100 Starliner spacecraft jettisons its heat shield before it lands in White Sands, N.M., after an aborted test flight to the International Space Station. On Friday, Feb. 6, 2020, NASA said Boeing faces 61 safety corrective actions following the unsuccessful December test.

Boeing Capsule Faces 61 Safety Fixes

The fixes follow last year's botched test flight.