A near-infrared image of the crowded inner 2 light-years of the Milky Way galaxy. Arrows pinpoint the galactic center, home to a supermassive black hole over 2 million times the mass of our Sun. The image shows the results of observations tracking star S2's orbit, confirming the black hole's presence and providing a test of Einstein's theory of gravity. Scale bar indicates 1 light-year.
Astronomy Picture from 23/10/2005
At the Center of the Milky Way
Source: https://apod.nasa.gov/apod/ap051023.html
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