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    The Dark Energy Pushing our Universe Apart may not be what it seems, scientists say

    November 25, 2024, Categories  Astronomy/Space

    The dark energy pushing our universe apart may not be what it seems, scientists say
    This Dec. 14, 2023 image made available by NOIRLab shows meteors from the Geminid meteor shower streaking across the sky above the Nicholas U. Mayall Telescope at Kitt Peak National Observatory (KPNO), a Program of NSF’s NOIRLab, in Tucson, Ariz. Credit: NSF’s NOIRLab via AP

    Distant, ancient galaxies are giving scientists more hints that a mysterious force called dark energy may not be what they thought.

    Astronomers know that the universe is being pushed apart at an accelerating rate and they have puzzled for decades over what could possibly be speeding everything up. They theorize that a powerful, constant force is at play, one that fits nicely with the main mathematical model that describes how the universe behaves...

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    Magnifying Deep Space Through the ‘Carousel Lens’

    September 19, 2024, Categories  Astronomy/Space

    Annotated Hubble Space Telescope image of the Carousel Lens, taken in two 10-minute exposures, one using an optical filter and another using an infrared filter.
    Hubble Space Telescope image of the Carousel Lens, taken in two 10-minute exposures, one using an optical filter and another using an infrared filter. The “L” indicators near the center (La, Lb, Lc, and Ld) show the most massive galaxies in the lensing cluster, located 5 billion light years away. Seven unique galaxies (numbered 1 through 7) – located an additional 2.6 to 7 billion light years beyond the lens – appear in multiple, distorted “fun-house mirror” iterations (indicated by each number’s letter index, e.g., a through d), as seen through the lens. (Credit: Credit: William Sheu (UCLA) using Hubble Space Telescope data.)

    A newly discovered cluster-scale strong gravitational lens, with a rare alignment of seven background lensed galaxies, provides a unique opportuni...

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    Hidden Supermassive Black Holes reveal their Secrets through Radio Signals

    September 27, 2023, Categories  Astronomy/Space

    An artist’s impression of a red quasar. Red quasars are enshrouded by gas and dust, which may get blown away by outflows from the supermassive black hole, eventually revealing a typical blue quasar. Credit: S. Munro & L. Klindt Licence: Attribution (CC BY 4.0)
    I think this is the strongest evidence so far that red quasars are a key element in how galaxies evolve
    Dr Victoria Fawcett

    Astronomers have found a striking link between the amount of dust surrounding a supermassive black hole and the strength of the radio emission produced in extremely bright galaxies. The findings are published in the Monthly Notices of the Royal Astronomical Society.

    The team of international astronomers, led by Newcastle University and Durham University, UK, used new data from the Dark Energy Spectroscopic Instrument (DESI), which is conducting a five year survey of large scale structure in the universe that will include optical spectra for ~3 million quasars; extremely bright galaxies powered by supermassive black holes...

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    Dark Energy measured with Record-breaking 3D Map of 1.2 million Galaxies

    July 15, 2016, Categories  Astronomy/Space

    The Sloan Digital Sky Survey and its Baryon Oscillation Spectroscopic Survey has transformed a two-dimensional image of the sky (left panel) into a three-dimensional map spanning distances of billions of light years, shown here from two perspectives (middle and right panels). This map includes 120,000 galaxies over 10% of the survey area. The brighter regions correspond to the regions of the Universe with more galaxies and therefore more dark matter. Credit: Jeremy Tinker and SDSS-III

    The Sloan Digital Sky Survey and its Baryon Oscillation Spectroscopic Survey has transformed a two-dimensional image of the sky (left panel) into a three-dimensional map spanning distances of billions of light years, shown here from two perspectives (middle and right panels). This map includes 120,000 galaxies over 10% of the survey area. The brighter regions correspond to the regions of the Universe with more galaxies and therefore more dark matter. Credit: Jeremy Tinker and SDSS-III

    A team of hundreds of physicists and astronomers constructed a 3D map to make one of the most precise measurements yet of the dark energy currently driving the accelerated expansion of the Universe. “We have spent 5 years collecting measurements of 1...

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