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 ...

Our best understanding of the universe is rooted in a cosmological model known as LCDM. The CDM stands for cold dark matter, where most of the matter in the universe isn't stars and planets, but a ...

The Hubble parameter is one of the central parameters in the modern cosmology. Their values inferred from the late-time observations are systematically higher than those from the early-time ...

The expansion rate of the universe is called the Hubble parameter. Because the fabric of the universe is being stretched out as it expands, galaxies farther away from us appear to be moving away ...

Once we discovered that the Universe was expanding, the next scientific step was to determine what the rate of expansion was. Despite the fact that it's been more than 80 years, we still don't have ...

BALTIMORE — Astronomers are honing measurements of a familiar cosmic parameter to shed new light on dark energy, the mysterious entity that’s accelerating the universe’s rate of expansion. Known as ...

The size and age of our Universe is not only a critically important issue in cosmology, but is also among the most controversial and delicate of the cosmological questions. Infrared observations made ...

A cosmic mystery that is one of the most significant open questions in physics may finally have been solved. The two main methods of measuring the universe’s rate of expansion have long been in ...