Humanity is on the verge of entering a new era of space exploration, with the Artemis III mission planning to return humans to the moon in 2026, for the first time in 50 years. Not only will Artemis see a woman and a person of color walk on the lunar surface for the first time, but the week-long mission to the south pole of the moon will begin a period of longer and longer stays in space.

This means that the impact of space environments on human health needs to be thoroughly investigated. This includes understanding the effect of "weightlessness" due to the microgravity found in space on physiology. While this seems to be negative, scientists are also investigating the impact of microgravity on cells, which suggests that microgravity can be advantageous.

NASA said June 14 that the Boeing Starliner and its crew will now return to Earth from the International Space Station no earlier than Saturday, June 22.

"The extra time allows the team to finalize departure planning and operations while the spacecraft remains cleared for crew emergency return scenarios within the flight rules," NASA said on its Kennedy Space Center blog.

The Starliner's test mission launched on June 5 from KSC with astronauts Butch Whitmore and Suni Williams. During its journey to the ISS, helium leaks were found in the spacecraft's thruster system.

Earlier in the week, NASA said its teams were continuing to assess what impacts, if any, the five small helium leaks would have on Whitmore's and Williams' return to Earth. At that time, the space agency scheduled Starliner's return for Tuesday, June 18, "pending weather and spacecraft readiness."

NASA has said that engineers had determined the helium leaks shouldn't impact Starliner's return. The agency said the craft had enough helium for 70 hours of free flight time when only seven hours would be required as part of its journey home.