Over the past 30 years, the Space Observatory has helped scientists discover and improve this accelerating rate — as well as revealing mysterious wrinkles that only new physics can solve.
Hubble has discovered more than 40 galaxies containing pulsars, as well as exploding stars called supernovae, to measure larger cosmic distances. These two phenomena help astronomers determine astronomical distances as mile markers, which indicate the rate of expansion.
In their quest to understand how fast our universe is expanding, astronomers already made an unexpected discovery in 1998: “dark energy.” This phenomenon acts as a mysterious driving force that is accelerating the rate of expansion.
And there is another development: an unexplained difference between the expansion rate of the local universe versus the expansion rate of the distant universe immediately after the big bang.
Scientists don’t understand the paradox, but they do admit that it’s strange and may require new physics.
“You get the most accurate measurement of the expansion rate of the universe from the gold standard for telescopes and cosmic tilt markers,” said Adam Rees, a Nobel Prize winner at the Space Telescope Science Institute and Distinguished Professor at Johns Hopkins University in Baltimore. in the current situation.
“That’s what the Hubble Space Telescope was built for, using the best technology we know to make. It’s probably a Hubble magnum, because it would take another 30 years of Hubble’s life to double the size of this sample.”
decades of surveillance
The telescope is named after pioneering astronomer Edwin Hubble, who discovered in the 1920s that distant clouds in the universe were actually galaxies. (died 1953).
Hubble built on astronomer Henrietta Swan-Levitt’s 1912 work to discover periods of brightness in pulsars called Cepheid variables. Cepheids act as cosmic tilt markers as they periodically light up and darken in and out of our galaxy.
Hubble’s work led to the revelation that our galaxy was one of many that forever changed our perspective and place in the universe. The astronomer continued his work and found that distant galaxies appear to be moving quickly, suggesting that we live in an expanding universe that began with the Big Bang.
Reiss continues to lead SHOES, short for Supernova, H0, for the state dark energy equation, a scientific collaboration that investigates the expansion rate of the universe. His team is publishing a paper in The Astrophysical Journal providing the latest update on the Hubble constant, as the rate of expansion is known.
Measuring distant objects has created a “cosmic distance ladder” that could help scientists better estimate the age of the universe and understand its underpinnings.
Several teams of astronomers using the Hubble telescope have arrived at the Hubble constant of plus or minus 73 kilometers per second per megaparsec. (One megafreck equals one million parsecs, or 3.26 million light-years.)
“Hubble’s constant is a very special number,” he said. “It could be used to sew a needle from the past to the present to test a comprehensive understanding of our universe. This requires an enormous amount of detailed work.” Licia Verdi, a cosmologist at the Catalan Institute for Research and Advanced Studies and the University of Barcelona’s Institute of Cosmology, said in a statement.
But the expected actual rate of expansion of the universe is slower than that observed by the Hubble telescope, according to astronomers using the Standard Cosmological Model of the Universe (a theory referring to the components of the Big Bang) and measurements made by Europeans. space agency. Plank. Working between 2009 and 2013.
The Planck Observatory, another space observatory, was used to measure the cosmic microwave background, or residual radiation from the Big Bang 13.8 billion years ago.
Planck scientists multiply the Hubble constant of 67.5 plus or minus 0.5 kilometers per second per megaparsec.
It presents an intriguing challenge to cosmologists who were once determined to measure the Hubble constant — and they are now wondering what additional physics might help them solve a new mystery about the universe.
“Actually, I don’t really care about the value of Libra specifically, but I like using it to learn about the universe,” said Reese.