than 2.2 billion light-years away, for more than 13 hours. The gravity of the cluster’s trillion stars, plus dark matter, acts as a 2-million-light-year-wide “lens” in space. This “gravitational lens” ...
A team of astrophysicists has created a simulated image that shows how the Nancy Grace Roman Space Telescope could conduct a mega-exposure similar to but far larger than Hubble’s celebrated Ultra Deep ...
The Hubble Space Telescope as seen from the Space Shuttle Discovery in December 1999. Credit: NASA In the summer of 1995, Robert Williams, then director of the Space Telescope Science Institute, which ...
Recent measurements from JWST have confirmed the validity of the “Hubble tension.” The Hubble tension stems from the fact that measuring the Hubble constant—the rate of the universe’s expansion—two ...
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