NASA astronauts Butch Wilmore and Suni Williams wave as they prepare to depart the Neil A. Armstrong Operations and Checkout Building at Cape Canaveral Space Force Station in Florida to board the Boeing CST-100 Starliner spacecraft on June 5. Miguel J. Rodriguez Carrillo/AFP via Getty Images hide caption
Butch Wilmore and Suni Williams inside the vestibule between the forward port on the International Space Station’s Harmony module and the Starliner spacecraft NASA hide caption
To celebrate the 25th anniversary of the launch of the Chandra X-ray Observatory, the mission released 25 views of cosmic objects ranging from supernova remnants to galaxy clusters and more. NASA/SAO/CXC hide caption
Gemini IV spacewalk, June 3, 1965. NASA astronaut Ed White became the first American to walk in space. NASA hide caption
NASA's Wide Field Infrared Survey Telescope is set to launch in 2027. This innovative telescope is designed to investigate long-standing astronomical mysteries, such as dark energy, the force behind the universe's expansion. NASA hide caption
This image from video provided by SpaceX shows the upper stage engine of a SpaceX Falcon 9 rocket, which blasted off from California on Thursday. SpaceX/AP hide caption
Two interacting galaxies, dubbed the Penguin and the Egg, are seen in more clarity and detail than ever, after NASA released a new image (right) from the James Webb Space Telescope. An older image from the Hubble Space Telescope is seen at left. NASA, ESA, CSA, STScI hide caption
The star cluster Omega Centauri contains millions of stars. The movement of some stars suggests that an intermediate-sized black hole lies at its center. NASA/ESA/STScI/AURA hide caption
A simulation of the formation of dark matter structures from the early universe until today. Ralf Kaehler/NASA/SLAC National Accelerator Laboratory, American Museum of Natural History hide caption
In this image made from video provided by NASA, CHAPEA commander Kelly Haston speaks in front of other crew members at Johnson Space Center in Houston on Saturday. NASA/AP hide caption
The Starliner spacecraft docked with the International Space Station and orbiting 262 miles above Egypt's Mediterranean coast on June 13. NASA says additional testing is needed before Starliner can return to Earth. NASA/AP hide caption
Discovered in 2016, a roughly Earth-sized planet orbiting our nearest neighboring star might be habitable. This artist's impression shows a view of the surface of the planet Proxima b orbiting the red dwarf star Proxima Centauri, the closest star to the solar system. ESO/M. Kornmesser hide caption
Boeing crew flight test astronauts Suni Williams and Butch Wilmore, center, pose with Expedition 71 flight engineers Mike Barratt, left, and Tracy Dyson, both NASA astronauts, in their spacesuits aboard the International Space Station's Quest airlock on June 24, 2024. /NASA via AP hide caption
The Chang'e 6 capsule landed in the Chinese province of Inner Mongolia on Tuesday. CCTV Screenshot by NPR hide caption
A red giant star and white dwarf orbit each other in this animation of a nova similar to T Coronae Borealis. NASA/Goddard Space Flight Center hide caption
A robotic arm at the International Space Station is seen releasing a pallet packed with batteries in 2021. NASA says a metal alloy stanchion from that flight equipment is what landed in a Florida home. NASA hide caption
Asteroid moonlet Dimorphos as seen by NASA's DART spacecraft 11 seconds before the impact that shifted its path through space, in the first test of asteroid deflection. Johns Hopkins University Applied Physics Laboratory/NASA hide caption
NASA's New Horizons spacecraft captured this high-resolution enhanced color view of Pluto on July 14, 2015. The image combines blue, red and infrared images taken by the Ralph/Multispectral Visual Imaging Camera. NASA/JHUAPL/SwRI hide caption
The Boeing Starliner spacecraft prepares to dock with the International Space Station for the first time on June 6, 2024. (NASA via AP) NASA/AP hide caption
Astronaut Wendy B. Lawrence was aboard the the Space Shuttle Endeavour for the STS-67/ASTRO-2 mission when it launched March 2nd, 1995. NASA hide caption
This picture, taken by Apollo 8 astronaut Bill Anders, is one of the most famous images ever photographed in space. It shows the earth rising against the barren lunar landscape on the first human mission to the moon in 1968. Bill Anders/NASA hide caption
SpaceX's mega rocket Starship launched from SpaceX's Starbase in Boca Chica, Texas on Thursday, June 6, 2024. Screenshot by NPR/SpaceX hide caption
Boeing's Starliner capsule lifted off from the Kennedy Space Center in Cape Canaveral, Fla. on Wednesday. It's the first time the capsule, powered by an Atlas V rocket made by United Launch Alliance, has flown people. Two NASA astronauts are on board for a day-long trip to the International Space Station. This test flight is years behind scheduled and billions of dollars over budget. MIGUEL J. RODRIGUEZ CARRILLO/AFP via Getty Images/AFP hide caption
The Hubble Space Telescope in orbit in 1999, just after a servicing mission by astronauts. NASA hide caption