APOD

Gravity smile Image provider: X-ray – NASA / CXC / J. Irwin et al.; Optical – NASA/STScI Description: 100 years ago this month, Einstein published his general theory of relativity, one of the most important scientific achievements of the last century. An important conclusion of Einstein’s theory of relativity is that matter can distort space-time. Therefore, a massive celestial body can distort the light emitted by the background celestial body, which we can observe. It is this phenomenon that makes these distant galaxies look strange. This “ Cheshire Cat ”…