Vesto Slipher first observed that galaxies are moving away from us. Edwin Hubble later showed a relationship between galaxy distance and speed. Hubble's work relied heavily on Slipher's earlier data.

If there is an absolute law in the universe, it’s that nothing can travel faster than the speed of light. Space is big, and ...

Whatever dark energy is, explanations for it have less wiggle room following a Hubble Space Telescope observation that has refined the measurement of the universe’s ...

Birthed from the minds of astronomers Edwin Hubble and Milton Humason, the Hubble constant has long been our closest attempt at understanding the universe's rate of expansion. However, recent attempts ...

On human timescales, the universe may as well be eternal. It’ll be here long after our species and our planet are gone, but ...

For almost a century, astronomers have been using the Hubble-Lemaitre constant to explain the accelerating expansion of the universe, an intrinsic piece of the puzzle that supports the Big Bang theory ...

On the night of Oct. 5, 1923, Edwin Hubble observed a strange star that flickered in intensity at regular intervals. The star ...

The question of how fast the universe is expanding continues to confound scientists. Although it might seem like a fairly straightforward issue, the reality is that it has been perplexing the best ...

Combined Webb and Hubble Space Telescope data showing the galaxy NGC 5584, 72 million light-years away. Image: Image NASA, ESA, CSA, Adam G. Riess (JHU, STScI) Image Processing Alyssa Pagan (STScI) ...

Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. The universe is expanding—but astronomers can’t agree how fast ...

Hubble’s measurements of today’s expansion rate do not match the rate that was expected based on how the Universe appeared shortly after the Big Bang over 13 billion years ago. Using new data from the ...

To many cosmologists, the best thing about neutron-star mergers is that these events scream into space an otherwise close-kept secret of the universe. Scientists combined the gravitational and ...