Technical problems could delay the beginning of regular flights by SpaceX's Crew Dragon (left) and Boeing's CST-100 Starliner until at least late 2018. Credit: SpaceX artist's concept and Boeing
Expedition 56 Flight Engineer Serena Auñón-Chancellor of NASA in the Destiny laboratory module June 11 with gear for measuring and analyzing red blood cell function to help doctors understand how blood cell production is altered in microgravity. Credit: NASA Johnson via Flickr
Falcon 9 CRS-15
ISS
Sam Scimemi, NASA's International Space Station director. Credit: NASA TV screen grab
the Soyuz MS-05 spacecraft, carrying a three-man crew, moves in for docking at the International Space Station six hours after launch Friday from the Baikonur Cosmodrome in Kazakhstan. Credit: NASA
Antares Cygnus OA-9
Axiom Space plans to build its privately funded commercial space station by 2024. Credit: Axiom Space
Dragon ISS
ISS
Cruz H2M
Illustration of a cargo version of Dream Chaser  docked to the International Space Station. Credit: Sierra Nevada Corp.
ISS
Artist's concept of Boeing's CST-100 Starliner capsule approaching the International Space Station. Credit: NASA/Boeing
Dragon Falcon 9 launch CRS-14
Credit: NASA

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