After Elon Musk said SpaceX would rescue the “stranded” Starliner astronauts, NASA moved their return date up by two weeks — a slight adjustment to a plan that had already been in place for months.

Their invention, the pineal gland simulator and regulator — or “Pinacal” — simulates the effects of sunset and sunrise in order to stimulate hormones, which in turn causes astronauts to experience a ...

In space, astronauts’ sleep cycles are thrown off due to the difference in day and night cycles, which can lead to health issues, such as fatigue. Their invention, the pineal gland simulator and ...