Hubble Space Telescope image showing the close passage of the nearby white dwarf Stein 2051 B in front of a distant source star. | Kailash C. Sahu et al.

Hubble Telescope Discovery Confirms Einstein's General Theory of Relativity

The space observatory witnessed the phenomenon of gravitational lensing for the first time, which Einstein theorized but predicted would be impossible to ever see.

June 7, 2017
2:02 PM EDT