Researchers detect rare X-ray flickers from distant black hole
Scientists have detected unusual X-ray pulses from black hole GRS 1915+105, nearly 28,000 light-years away. Using India's AstroSat observatory, they observed alternating bright and dim phases lasting hundreds of seconds. In bright phases, the black hole's corona shrank and heated, producing rapid 70-per-second flickers, which disappeared when the corona cooled and expanded during dim phases.