NASA astronauts Kate Rubins left and Jeff Williams prepare to grapple the SpaceX Dragon supply spacecraft from aboard the International Space Station.

NASA astronauts Kate Rubins (left) and Jeff Williams (right) prepare to grapple the SpaceX Dragon supply spacecraft from aboard the International Space Station. The nearly 5,000 pounds of supplies and equipment includes science supplies and hardware, including instruments to perform the first-ever DNA sequencing in space, and the first of two identical international docking adapters (IDA.) The IDAs will provide a means for commercial crew spacecraft to dock to the station in the near future as part of NASA’s Commercial Crew Program. Dragon is scheduled to depart the space station Aug. 29 when it will return critical science research back to Earth.