On Episode 165 of This Week In Space, Rod Pyle and Tariq Malik talk with NASA astronaut Nick Hague, the first U.S. Space Force Guardian to launch to the International Space Station in that role.
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.

