Scientists are testing a novel way to measure cosmic expansion using time delays in gravitationally lensed quasars. Their ...

This collection of 36 images from NASA's Hubble Space Telescope features galaxies that are all hosts to both Cepheid variables and supernovae. These two celestial phenomena are both crucial tools used ...

NASA announced Thursday that its Hubble Space Telescope (HST) has calibrated more than 40 "milepost markers" of space and time. The mile markers help scientists measure the expansion rate of the ...

Interstellar visitor 3I/ATLAS has returned to Hubble’s field of view, and the fresh images are forcing astronomers to rethink ...

A team of astronomers using a variety of ground and space-based telescopes including the W. M. Keck Observatory on Maunakea, ...

Why did some galaxies from the early universe suddenly stop making stars? Astronomers look back in time to find out. Monisha Ravisetti was a science writer at CNET. She covered climate change, space ...

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New observations by the Hubble Space Telescope suggest that the unexpected dimming of the red supergiant star Betelgeuse was most likely caused by an immense amount of hot material ejected into space, ...

When telescopes like Hubble peer out into the cosmos, they can sometimes sneak a view of very distant objects using a phenomenon called gravitational lensing. This is where a massive object like a ...

‘Pursuit of the universe’s expansion rate began in the 1920s with measurements by astronomers Edwin P. Hubble and Georges Lemaître. In 1998, this led to the discovery of “dark energy,” a mysterious ...

With 30 years of marathon, NASA's Hubble Space Telescope has achieved more than 40 "milepost markers" of space and time to expand scientists' knowledge on the measurement of the expansion rate of the ...

NASA's Hubble Space Telescope has calibrated more than 40 'milepost markers' of space and time to help scientists precisely measure the expansion rate of the universe -- a quest with a plot twist.