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    Science FTW

    UT Austin astronomers discover largest black hole in history with a mass of 17billion suns

    Jonathan Rienstra
    Dec 1, 2012 | 1:37 pm
    • The black hole at the center of galaxy NGC 1277 is 11 times the diameter ofNeptune's orbit.
      D. Benningfield / K. Gebhardt / StarDate
    • NGC 1277 is 22 million light years away in the Perseus constellation.
      NASA / ESA / Andrew C. Fabian

    Astronomers at the University of Texas at Austin’s McDonald Observatory near Fort Davis have found what they believe may be the most massive black hole ever discovered, according to a report in the journal Nature.

    Equal to the mass of 17 billion suns, this black hole sits at the center of galaxy NGC 1277 in the constellation Perseus. It's 220 million light years from Earth and four light days in diameter, meaning that it would take light four days to travel across it — not that light could, because it’s a black hole.

     

      The black hole sits at the center of galaxy NGC 1277. It’s 220 million light years from Earth and four light days in diameter.

    To put that size in perspective, Earth’s orbit is 17 light minutes in diameter, or .0029 percent of four light days. The black hole is large, to say the least. Even more impressive is that it accounts for 14 percent of its galaxy’s mass. The average is 0.1 percent.

    Astronomers studied NGC 1277 with the Hobby-Eberly Telescope as part of their Massive Galaxy Survey to understand the relationship between galaxies, black holes and how they grow.

    What makes this discovery even more interesting is that previously astronomers had found the largest black holes in large “blobby” galaxies called “ellipticals.” NGC 1277 is considerably smaller, at only one-tenth the size and mass of the Milky Way, and it is shaped more like a lens.

    Team member Karl Gebhardt of UT Austin says this find might signify a discovery of a new galaxy.

    “This is a really oddball galaxy,” he says. “It's almost all black hole. This could be the first object in a new class of galaxy-black hole systems.”

    So far the team at McDonald Observatory have studied 700 of their 800 galaxies with the Hobby-Eberly Telescope, a 9.2 meter joint project between UT Austin; Penn State; Ludwig Maximilians Universität München in Munich, Germany; and Georg-August-Universität Göttingen in Germany.

    unspecified
    news/innovation

    Building boom

    Dallas comes in at No. 1 in the U.S. for retail construction in 2025

    John Egan
    Jul 25, 2025 | 3:40 pm
    construction
    Photo by Josh Olalde on Unsplash
    Nearly 7.15 million square feet of space are under construction in DFW.

    Get ready for a gigantic cartload of new shopping opportunities in Dallas-Fort Worth. A new report, published by commercial real estate services provider Lee & Associates, says DFW leads more than 60 U.S. retail markets with nearly 7.15 million square feet of space under construction.

    To put that in perspective: If the average Walmart supercenter measures 182,000 square feet, the nearly 7.15 million-square-foot total would work out to 39 new supercenters being built in the region.

    The amount of retail space going up in DFW represents 15 percent of all retail space under construction in the more than 60 U.S. markets tracked by Lee & Associates.

    According to the report, the Dallas-Fort Worth industrial market remains on a path of growth, with vacancy rates continuing to trend below 10 percent, reflecting sustained demand for space.

    This quarter, nearly 7 million square feet of new industrial space was delivered, more than doubling the volume from the first quarter — highlighting a steady upward trend.

    “After some crushingly slow post-pandemic years, retail construction throughout the Dallas-Fort Worth region this year is on pace to hit its highest point since 2017,” Bisnow reported.

    What’s behind the surge in retail construction? Population growth. Data recently released by the U.S. Census Bureau shows DFW was the country’s third-fastest-growing metro from 2023 to 2024, based on the number of new residents.

    DFW is by far the most active U.S. market for new retail space. (Just look at how many grocery stores are being built in the area.)

    Houston and Austin aren’t too far behind Dallas-Fort Worth, though.

    The second-ranked Houston area has nearly 3.9 million square feet of retail space under construction, according to the report, and the third-ranked Austin area has more than 3.4 million square feet of retail space being built.

    Houston was the second-fastest-growing metro from 2023 to 2024, according to the Census Bureau, and Austin landed at No. 13.

    news/innovation
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