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Tuesday, August 2, 2022

Gamma ray bursts could help unravel how fast the universe is expanding - New Scientist

It may be possible to use the brightest events in the universe, gamma ray bursts, to measure cosmic distances – which could help researchers figure out the universe’s structure

Space 2 August 2022

By Leah Crane

NASA image release November 9, 2010 Using data from NASA's Fermi Gamma-ray Space Telescope, scientists have recently discovered a gigantic, mysterious structure in our galaxy. This never-before-seen feature looks like a pair of bubbles extending above and below our galaxy's center. But these enormous gamma-ray emitting lobes aren't immediately visible in the Fermi all-sky map. However, by processing the data, a group of scientists was able to bring these unexpected structures into sharp relief. Each lobe is 25,000 light-years tall and the whole structure may be only a few million years old. Within the bubbles, extremely energetic electrons are interacting with lower-energy light to create gamma rays, but right now, no one knows the source of these electrons. Are the bubbles remnants of a massive burst of star formation? Leftovers from an eruption by the supermassive black hole at our galaxy's center? Or or did these forces work in tandem to produce them? Scientists aren't sure yet, but the more they learn about this amazing structure, the better we'll understand the Milky Way. To learn more go to: http://www.nasa.gov/mission_pages/GLAST/news/new-structure.html NASA Goddard Space Flight Center enables NASA???s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a leading role in NASA???s accomplishments by contributing compelling scientific knowledge to advance the Agency???s mission. Follow us on Twitter Join us on Facebook Credit: NASA/Goddard Space Flight Center Scientific Visualization Studio

Gamma ray bursts occur when huge stars die in supernova explosions or when massive objects such as neutron stars smash together

NASA/Goddard Space Flight Center Scientific Visualization Studio

Blasts of gamma rays from the distant universe may provide a new way to measure cosmic distances. These gamma ray bursts (GRBs) could help us understand the structure and expansion of the universe.

GRBs are the brightest events in the universe. They occur when huge stars die in supernova explosions or when massive objects such as neutron stars smash together, producing powerful flashes of radiation.

Maria Giovanna Dainotti at …

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Gamma ray bursts could help unravel how fast the universe is expanding - New Scientist
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