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Jean-Paul Charles Aymard Sartre (ˈsɑːrtrə, ˈsɑːrt; saʁtʁ; 21 June 1905 – 15 April 1980) was a French philosopher, playwright, novelist, screenwriter, political activist, biographer, and literary cr
A gravitational lens is a distribution of matter (such as a cluster of galaxies) or a point particle between a distant light source and an observer that is capable of bending the light from the sour
The Hubble Space Telescope (often referred to as HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It was not the first space telescope, b
In astrophysics, an event horizon is a boundary beyond which events cannot affect an observer. Wolfgang Rindler coined the term in the 1950s.In 1784, John Michell proposed that gravity can be stron
The James Webb Space Telescope (JWST) is a space telescope specifically designed to conduct infrared astronomy. Its high-resolution and high-sensitivity instruments allow it to view objects too old,