Utilizing known lengths of 50 galaxies from Earth to clarify Hubble’s constant measurements, a team of scientists led by a University of Oregon astronomer approximates the Universe’s age at 12.6 billion years.
Approaches to measuring the Big Bang rely on computational modeling, mathematics, utilizing distance estimates of the ancient stars, the rate of the Universe’s expansion, and the behavior of galaxies. The concept is to calculate how long it would take all objects to return to their initial state. Here is what the scientists found.
New Technique to Calculate the Universe’s Age
A significant calculation for dating the Universe’s Age is the Hubble’s constant. Another new technique utilizes observations of leftover radiation from the Big Bang. Such a method maps wiggles and bumps in spacetime – the CMB (Cosmic Microwave Background) – and reflects conditions in the young Universe as set by Hubble’s constant.
However, these techniques reach various conclusions, as explained by James Schombert, a professor of physics at the University of Oregon. He and his team reveal a new approach that recalibrates a length-measuring tool dubbed the baryonic Tully-Fisher relation independently of Hubble’s constant.
“The distance scale problem, as it is known, is incredibly difficult because the distances to galaxies are vast and the signposts for their distances are faint and hard to calibrate,” detailed Schombert.
His team’s approach defines the Hubble’s constant at 75.1 kilometers/s/megaparsec (a unit of space-related measurements, equal to one million parsecs). The approach also explains how all Hubble’s constant values below 70 can be ruled out with a 95 % degree of confidence.
Calculations resulted from observations of NASA’s Wilkinson Microwave Anisotropy Probe back in 2013, indicated that the Universe’s age is 13.77 billion years, which represents, for the moment, the standard model of Big Bang cosmology. As for the Hubble’s constant values, they generally approximate the Universe’s age at between 12 billion and 14.5 billion years.
The new approach, based on observations realized with the Spitzer Space Telescope, brings a new element to how measurements to reach Hubble’s constant can be established.