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    These galaxies are selected from a Hubble Space Telescope program to measure the expansion rate of the universe, called the Hubble constant. The value is calculated by comparing the galaxies' distances to the apparent rate of recession away from Earth (due to the relativistic effects of expanding space). By comparing the apparent brightnesses of the galaxies' red giant stars with nearby red giants, whose distances were measured with other methods, astronomers are able to determine how far away each of the host galaxies are. This is possible because red giants are reliable milepost markers because they all reach the same peak brightness in their late evolution. And, this can be used as a "standard candle" to calculate distance. Hubble's exquisite sharpness and sensitivity allowed for red giants to be found in the stellar halos of the host galaxies. The red giants were searched for in the halos of the galaxies. The center row shows Hubble's full field of view. The bottom row zooms even tighter into the Hubble fields. The red giants are identified by yellow circles. Credit: NASA, ESA, W. Freedman (University of Chicago), ESO, and the Digitized Sky Survey
    Space

    New Hubble constant measurement adds to mystery of universe’s expansion rate

    Investigated region on Ryugu. Credit: German Aerospace Center (DLR)
    Space

    Small fragments of carbon-containing asteroids are too fragile to survive atmospheric...

    Space

    NASA to broadcast next space station resupply launch, prelaunch activities

    Space

    Astronomers observed two dwarf planets with gas disk around them

    GSLV MkIII-M1 / Chandryaan 2 vehicle night view at the Second Launch Pad
    Space

    Chandrayan 2 mission has been put on hold citing technical issues

    Hayabusa2 probe successfully collects first samples from Ryugu asteroid
    Space

    Hayabusa2 probe successfully collects first samples from Ryugu asteroid

    At the Baikonur Cosmodrome in Kazakhstan, Expedition 60 crew members Drew Morgan of NASA, Alexander Skvortsov of the Russian space agency Roscosmos and Luca Parmitano of ESA (European Space Agency) pose for pictures July 5, 2019, in front of their Soyuz MS-13 spacecraft during prelaunch preparations. They will launch July 20, 2019 from Baikonur for their mission on the International Space Station. Credits: Roscosmos/Andrey Shelepin
    Space

    NASA to provide live coverage of Crew’s Launch and Arrival at...

    An animated map that shows where in the night sky more than 4,000 extrasolar planets are. Matt Russo and Andrew Santaguida/SYSTEM Sounds (via YouTube)
    Space

    NASA just released stunning video map of all 4,000 exoplanets

    Artist’s impression of NGC3147 black hole disc
    Space

    Hubble discovers mysterious black hole disc

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