Astronaut Jeffrey Hoffman removes Wide Field and Planetary Camera 1 (WFPC 1) during change-out operations. This was taken during the first Hubble servicing mission, which led to some of the greatest images humanity has ever taken, from both a scientific and an aesthetic perspective. Image credit: NASA.

5 NASA photos that changed the world

“Truth in science, however, is never final, and what is accepted as a fact today may be modified or even discarded tomorrow. Science has been greatly successful at explaining natural processes, and this has led not only to increased

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The Universe is out there, waiting for you to discover it.

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Ethan Siegel

The Universe is: Expanding, cooling, and dark. It starts with a bang! #Cosmology Science writer, astrophysicist, science communicator & NASA columnist.