Testing gravity is simple: walk out of a second-floor window and see
what happens. It's a lot tougher to test Albert Einstein's theory of
gravity—the general theory of relativity—which says that the gravity of
an object warps space and time around it. Although researchers have
proved general relativity on the scale of the solar system, validating
it on cosmic scales has been more challenging. That's exactly what a
group of astrophysicists in Denmark have now done.
The researchers, led by Radek Wojtak of the Niels Bohr Institute at
the University of Copenhagen, set out to test a classic prediction of
general relativity: that light will lose energy as it is escaping a
gravitational field. The stronger the field, the greater the energy
loss suffered by the light.
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