NASA astronaut Serena Auñón-Chancellor speaks about her experience on Expeditions 56 and 57 onboard the International Space Station at NASA Headquarters, Friday, June 14, 2019 in Washington. Auñón-Chancellor spent 197 days living and working onboard the orbital laboratory, contributing to hundreds of experiments in biology, biotechnology, physical science, and Earth science. She began her career at NASA as a flight surgeon before being selected as an astronaut in 2009. Photo Credit: (NASA/Aubrey Gemignani)