This artist's concept shows stars, black holes, and nebula laid over a grid representing the fabric of space-time. Ripples in this fabric are called gravitational waves. Astronomers have found evidence of gravitational waves created by black holes billions of times the mass of the Sun. NANOGrav collaboration; Aurore Simonet hide caption
This cutaway view of Saturn's moon Enceladus is an artist's rendering that depicts possible hydrothermal activity that may take place on and under the seafloor of the moon's subsurface ocean. NASA/JPL-Caltech hide caption
The view from the Jerome C. Daniel Overlook on Mulholland Drive. Willem Verbeeck for NPR hide caption
Head of the Brain-Computer Interface Programm at the French Atomic Energy and Alternative Energies Commission (CEA), Guillaume Charvet from France, shows implants that allows a paralyzed man to walk naturally, during a press conference in Lausanne on May 23, 2023. Fabrice Coffrini/AFP via Getty Images hide caption