This trip includes a Dragon resupply capsule carrying NASA's Bigelow Expandable Activity Module, a living space that essentially inflates once it's installed on the ISS. BEAM is the type of tech that NASA could use on a trip to Mars, since it's small in transport, durable and easy to set up.

"BEAM is one of the first steps to test expandable structures as a viable alternative to traditional space habitats," NASA writes.

Today, SpaceX will try once again to land its Falcon 9 rocket on top of a small rectangle in the ocean. While the SpaceX crew has brought a rocket back to Earth, it's yet to successfully touch down on the ocean landing strip, despite multiple attempts. These sea landings are a crucial part of SpaceX's plan to re-use its rockets and save money on each blast-off. By the end of the year, the company plans to launch a Falcon 9 rocket every other week, Ars Technica reports, so ration your popcorn accordingly.

Update: Success! It landed!