Oleg Zabluda's blog
Sunday, August 05, 2018
 
"""
"""
S2 star [...] comes closer to the black hole than any other star yet detected: about 120 a.u., or four times Neptune’s distance from the Sun. [...] S2’s flyby enables two tests of general relativity. The first is the gravitational redshift [...] about 200 km/s.
"""
https://www.skyandtelescope.com/astronomy-news/star-swings-around-black-hole-tests-gravity/

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