“We are Very Perplexed” –Gaia and Hubble Space

“The tension seems to have grown into a full-blown incompatibility between our views of the early and late time universe,”

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The combined new data from the Gaia and Hubble Space Telescope data are in serious conflict with the Cosmic Microwave Background data," said Planck team member George Efstathiou of the Kavli Institute for Cosmology in Cambridge. The results fuel the mismatch between measurements for the expansion rate of the nearby universe, and those of the distant, primeval universe’before stars and galaxies even existed.

Moving on.

Combining observations from NASA's Hubble Space Telescope and the European Space Agency's (ESA) Gaia space observatory (below), astronomers further refined the previous value for the Hubble constant, the rate at which the universe is expanding from the big bang 13.8 billion years ago.

  • Publisher: The Daily Galaxy –Great Discoveries Channel
  • Citation: Web link

Not to change the topic here:

Hubble and Gaia team up to fuel cosmic conundrum

IMAGE: Using two of the world’s most powerful space telescopes — NASA’s Hubble and ESA’s Gaia — astronomers have made the most precise measurements to date of the universe’s expansion rate… view more 


This so-called “tension” implies that there could be new physics underlying the foundations of the universe. Possibilities include the interaction strength of dark matter, dark energy being even more exotic than previously thought, or an unknown new particle in the tapestry of space.

But as the measurements have become more precise, the team’s determination of the Hubble constant has become more and more at odds with the measurements from another space observatory, ESA’s Planck mission, which is coming up with a different predicted value for the Hubble constant.

  • Publisher: EurekAlert!
  • Twitter: @EurekAlert
  • Citation: Web link

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