Astronauts collect blood aboard the ISS | Space photo of the day for July 21, 2025By otako_fzbgs4 / July 21, 2025 Astronauts aboard the International Space Station collect blood samples as part of a project to study human health in space. Related posts: The MacBook Pro is one of the best laptops for astronomers and it's just hit its lowest-ever price NASA still mulling options for Boeing's troubled Starliner astronaut capsule Large alien planets may be born in chaos, NASA's retired exoplanet-hunter finds What were Stephen Hawking's greatest contributions to science?
