Thursday, 2 February 2017
In recent research, an international group of physicists from the H0LiCOW collaboration used NASA’s Hubble Space Telescope and the Spitzer Space Telescope to estimate the universe’s current expansion rate.
This newly calculated number — about 71.9 kilometers per second per megaparsec — is in agreement with last year’s measurements by a research team led by Nobel laureate Adam Riess. But the new measurement does not match the rate estimated by the ESA’s Planck satellite mission in 2015.
Astrophysicists have offered that the intriguing disagreement between measurements can be explained by the use of differing analysis methods by the two teams.
H0LiCOW analyzed the way that light bends around the gravity wells of five distant galaxies, specifically chosen for their positions between us and more distant superbright galactic cores known as quasars.
The Planck number, however, is a projection based on the observation of the cosmic background radiation, the light left over from the Big Bang.
The shift in the estimate of the Hubble constant challenges our current understanding of the cosmos, indicating that the universe is likely much more complex than currently thought.
Source by: Internet