Updated on June 4: SpaceX has delayed the launch of its CRS-28 cargo mission to no earlier than Monday (June 5) at 11:47 a.m. EDT (1547 GMT) due to strong winds in the rocket recovery zone. The launch had been scheduled to occur on Sunday (June 4), just four hours after another SpaceX Falcon 9 launch of 22 V2 Starlink satellites from a nearby pad at Cape Canaveral Space Force Station.
SpaceX will launch its 28th cargo mission to the International Space Station for NASA Monday (June 5) after a two-day weather delay, and you can watch the action live.
A SpaceX Falcon 9 rocket is now scheduled to launch a robotic Dragon cargo capsule toward the orbiting lab Monday at 11:47 a.m. EDT (1547 GMT) from NASA's Kennedy Space Center in Florida. The launch was originally scheduled for Saturday (June 3), but SpaceX announced a 24-hour delay in the wee hours, citing the need to "allow more time for vehicle preparations and for weather conditions to improve," according to a Twitter update. On Sunday (June 4), SpaceX announced another one-day delay, citing strong winds in the rocket recovery zone.
You can watch the launch here at Space.com, courtesy of NASA, or directly via the space agency of SpaceX. SpaceX's webcast will begin about 20 minutes before liftoff. There's no guarantee the Dragon will get off the ground on time, however; in fact, there's a 40% chance that the weather won't cooperate on Monday. If the launch doesn't happen Monday, the next opportunity comes on Wednesday (June 7) at 11:01 a.m. EDT (1501 GMT).
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The Falcon 9 will carry the uncrewed Dragon capsule to orbit on a rendezvous course for the International Space Station (ISS). Following stage separation, the Falcon 9's first stage will perform a boost-back burn and land on SpaceX's autonomous droneship A Shortfall of Gravitas, which will be stationed in the Atlantic Ocean.
The cargo Dragon will spend just over 40 hours on an intercept course with the International Space Station. You can watch the capsule's docking with the orbiting lab here at Space.com too, when the time comes.
Dragon will carry a few thousand pounds of science investigation supplies and provisions for the station's crew. A delayed launch of Northrop Grumman's Cygnus ISS resupply vehicle, NG-19, prompted NASA to transfer some of that mission's intended cargo to Dragon in order to keep the space station's cache from diminishing too much.
During a prelaunch press briefing on Tuesday (May 30), NASA's ISS chief scientist Kirt Costello said that CRS-28 is "making up for the delays we had in our NG Cygnus vehicle arriving at Station. So, we're sending up lots of extra logistics crew supplies for the crew to keep them going throughout the end of the year."
The scientific research aboard CRS-28 brings new experiments to the ISS, as well as replenishing materials for over 30 ongoing projects. The CLINGER technology demonstration for autonomous space station docking systems, microgravity-induced DNA mutation of telomeres and blue energy thunderstorm discharge research are among some of the new science experiments going up on this mission.
Half a dozen cubesats are tucked away onboard the CRS-28 Dragon as well, all but one of which are student-run projects from the Canadian Space Agency's Canadian Cubeaat program. The sixth comes from the Aerospace Corporation, in partnership with the Air Force Research Laboratory and Space Systems Command. It's called Moonlighter, and it will provide the platform for a space-based cybersecurity hacking challenge.
CRS-28 also carries the next pair of iROSAs (International Space Station Roll Out Solar Arrays), which are being attached above the ISS' existing solar panels in order to augment station electricity needs. Those will be removed from Dragon's trunk using the station's robotic arm, then installed by NASA astronauts over the course of two spacewalks. Once operational, the full complement of iROSAs will boost the orbiting lab's power supply by 20% to 30%.
SpaceX's cargo Dragon is designed as a reusable vehicle, and will return scientific samples from over 34 investigations aboard the ISS at the end of its stay at the station. Like its crewed counterpart, the cargo Dragon comes back to Earth for soft, parachute-aided ocean splashdowns.
