expansion of the universe

Quasars with a Double-Image Gravitational Lens Could Help Finally Figure out how Fast the Universe is Expanding

Quasars with a Double-Image Gravitational Lens Could Help Finally Figure out how Fast the Universe is Expanding

How fast is the Universe expanding? That’s a question that astronomers haven’t been able to answer accurately. They have a name for the expansion rate of the Universe: The Hubble Constant, or Hubble’s Law. But measurements keep coming up with different values, and astronomers have been debating back and forth on this issue for decades.

The universe’s rate of expansion is in dispute – and we may need new physics to solve it

The universe’s rate of expansion is in dispute – and we may need new physics to solve it

Next time you eat a blueberry (or chocolate chip) muffin consider what happened to the blueberries in the batter as it was baked. The blueberries started off all squished together, but as the muffin expanded they started to move away from each other. If you could sit on one blueberry you would see all the others moving away from you, but the same would be true for any blueberry you chose. In this sense galaxies are a lot like blueberries.

Measuring growth of the universe reveals a mystery

Measuring growth of the universe reveals a mystery

Astronomers have made the most precise measurement to date of the rate at which the universe is expanding.But there’s also some unsettling news: The new number remains at odds with independent measurements of the early universe’s expansion, which could mean that there is something unknown about the makeup of the universe.

Cosmic lenses support finding on faster than expected expansion of the Universe

Cosmic lenses support finding on faster than expected expansion of the Universe

By using galaxies as giant gravitational lenses, an international group of astronomers using the NASA/ESA Hubble Space Telescope have made an independent measurement of how fast the Universe is expanding. The newly measured expansion rate for the local Universe is consistent with earlier findings. These are, however, in intriguing disagreement with measurements of the early Universe. This hints at a fundamental problem at the very heart of our understanding of the cosmos.

Relax, the expansion of the universe is still accelerating

Relax, the expansion of the universe is still accelerating

There’s been a whirlwind of commentary of late speculating that the acceleration of the expanding universe might not be real after all. It follows the publication this month of a new look at supernovae in our universe, which the researchers say give only a “marginal detection” of the acceleration of the universe.

Hubble finds Universe may be expanding faster than expected

Hubble finds Universe may be expanding faster than expected

Astronomers have used Hubble to measure the distances to stars in nineteen galaxies more accurately than previously possible. They found that the Universe is currently expanding faster than the rate derived from measurements of the Universe shortly after the Big Bang. If confirmed, this apparent inconsistency may be an important clue to understanding three of the Universe’s most elusive components: dark matter, dark energy and neutrinos.