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What is the theory of general relativity? Understanding Einstein's space-time revolution

Albert Einstein's theory of general relativity is based on the idea that massive objects cause a distortion in space-time, which is felt as gravity.

Space · Jan 5, 2022

What are Dyson spheres, and how do we look for them?

Learn who first thought of the idea for Dyson spheres, as well as how they work and how we search for them with infrared telescopes.

Space · Aug 1, 2019

Project Mercury: America's 1st crewed space program

Project Mercury was NASA's program that launched the first American astronauts into space, completing a total of six crewed spaceflights.

Space · Aug 21, 2018