With this week's expected arrival of a visiting crew delayed, science and maintenance work on board the International Space Station was lighter than usual for the Expedition 73 crew.
We don't know what dark matter is, but that doesn't stop astronomers from using it to their advantage. Dark matter is part of what makes gravitational lensing so effective. Astronomers expect the Roman Space Telescope to find 160,000 gravitational lenses, and dark matter makes a crucial contribution to these lenses.

