A star just zipped past the Milky Way's central black hole at nearly 3% the speed of light. The star, named Source 2, verified Einstein's prediction of gravitational redshift, which is when a strong gravitational field causes light to stretch its wavelength so it can keep moving at a constant speed.

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A star just zipped past the Milky Way's central black hole at nearly 3% the speed of light. The star, named Source 2, verified Einstein's prediction of gravitational redshift, which is when a strong gravitational field causes light to stretch its wavelength so it can keep moving at a constant speed.