SpaceX’s Dragon cargo Spacecraft resupply mission to the International Space Station for NASA

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SpaceX’s upgraded Dragon cargo spacecraft splashed down at 8:26 p.m. EST on Wednesday west of Tampa off the Florida coast, marking the return of the company’s 21st contracted cargo resupply mission to the International Space Station for NASA. The spacecraft carried more than 4,400 pounds of valuable scientific experiments and other cargo back to Earth. Some of the scientific investigations Dragon returns to Earth are: Cardinal Heart Microgravity causes changes in the workload and shape of the human heart, and it is still unknown whether these changes could become permanent if a person lived more than a year in space.

The sextant used in the Sextant Navigation experiment will be returning to Earth.

Sailors have navigated via sextants for centuries, and NASA’s Gemini missions conducted the first sextant sightings from a spacecraft.