## Gravitational Lens Confirms the Hubble Tension

Gravitational Lens Confirms the Hubble Tension We’ve known the Universe is expanding for a long time. The first solid paper demonstrating cosmic expansion was published by Edwin Hubble in 1929, based on observations made by Vesto Slipher, Milton Humason, and Henrietta Leavitt. Because of this, the rate of cosmic expansion is known as the Hubble constant, or Hubble parameter, H0. From this parameter, you can calculate things such as the age of the Universe since the Big Bang, so knowing the value of H0 is central to our understanding of modern cosmology. Early on, the measured value of the Hubble parameter varied widely. Hubble’s initialRead More →