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How many solar masses is the central black hole in the Whirlpool Galaxy? - Astronomy

Rogue black holes exist, because mergers can go wrong

Mystery of Our Cosmic Fate --"New Data on the Expansion Rate Doesn't Match Extrapolations from 13.8 Billion Years Ago"

  Something is messing with our universe, and that something is the enduring mystery astronomers have dubbed dark energy –which comprises about two-thirds of the mass and energy in the universe. Determining how rapidly the universe is expanding is key to understanding our cosmic fate, but with more precise data has come a conundrum, reports the University of California Berkeley: “estimates based on measurements within our local universe don’t agree with extrapolations from the era shortly after the Big Bang 13.8 billion years ago. A new estimate of the local expansion rate the Hubble constant, or H0 (H-naught) reinforces that discrepancy.”

How fast is universe expanding? Galaxies provide one answer

NGC 1453, a giant elliptical galaxy situated in the constellation Eridanus, was one of 63 galaxies used to calculate the expansion rate of the local.