"Fact is stranger than fiction" might never be more true than when it comes to deep space science. The Hubble Space Telescope recently captured images of the Abell S1063 galaxy cluster, and they give us insight deep into the past.
If you're not familiar with gravitational lensing, it's a phenomenon first correctly predicted by Einstein's General Theory of Relativity. Because massive objects distort the spacetime fabric around them, light itself will be bent when traveling through that fabric, creating a magnification effect. It was first confirmed in 1979, and astronomers now take advantage of it to see farther into space than we would be capable of otherwise.
Gravitational lensing doesn't just help us see farther into space. It causes false copies of galaxies to appear in images, and the distribution of these copies tell scientists more about how gravity is distorting the image and thus, more about the distribution of matter inside the galaxy cluster. Science is remarkable.
Images from NASA, ESA, J. Lotz (STScI), and Digitized Sky Survey 2, used under public domain.