ब्रह्मांड के रहस्यमय पावरहाउस: ब्लेज़ार से मिले नए एक्स-रे संकेत खोलेंगे आकाशगंगाओं के राज़: Scientists studied X-ray light from four special galaxies called BL Lac objects that shine brightly in high-energy rays. They used data from two space telescopes, NICER and NuSTAR, looking at 13 different observations of Mrk 421, Mrk 501, PG 1553+113, and PKS 2155-304. Most spectra fit a simple curved model well. But six observations of
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