Gamma-ray burst breaks record for biggest cosmic explosion
Washington: Cosmic explosion caused by the death of a star in a distant galaxy became the focus of astronomers around the world after it occurred in April.
The explosion, known as a gamma-ray burst and designated GRB 130427A, has topped the charts as one of the brightest ever seen.
A trio of NASA satellites, working in concert with ground-based robotic telescopes, captured never-before-seen details that challenge current theoretical understandings of how gamma-ray bursts work.
"We expect to see an event like this only once or twice a century, so we`re fortunate it happened when we had the appropriate collection of sensitive space telescopes with complementary capabilities available to see it," Paul Hertz, director of NASA`s Astrophysics Division in Washington, said.
Gamma-ray bursts are the most luminous explosions in the cosmos, thought to be triggered when the core of a massive star runs out of nuclear fuel, collapses under its own weight, and forms a black hole. The black hole then drives jets of particles that drill all the way through the collapsing star and erupt into space at nearly the speed of light.
Gamma-rays are the most energetic form of light. Hot matter surrounding a new black hole and internal shock waves produced by collisions within the jet are thought to emit gamma-rays with energies in the million-electron-volt (MeV) range, or roughly 500,000 times the energy of visible light.
The most energetic emission, with billion-electron-volt (GeV) gamma rays, is thought to arise when the jet slams into its surroundings, forming an external shock wave.
NASA`s Swift Gamma-ray Burst Mission detected the burst almost simultaneously with the GBM and quickly relayed its position to ground-based observatories.
More from India
More from World
More from Sports
More from Entertaiment
- Watch: PM Narendra Modi addressing rally in Imphal
- Will Shiv Sena join hands with Congress to stop BJP from entering BMC?
- Report: Are mobile smartphones more unhygienic than toilet seats?
- Delhi: Three-year-old twins die after falling into washing machine in Rohini
- BSF catches cow slaughter gang near India-Bangladesh border in Malda
- Ind vs Aus: Mohammed Azharuddin says Jayant Yadav and Ishant Sharma should be replaced in next Test
- WATCH: Kieron Pollard's epic celebration after destroying Lahore Qalandars in Dubai
- Indian doctor rescued from ISIS recounts horror, says 'they forced me to watch videos, shot me thrice'
- Mitchell Johnson takes a dig at Anil Kumble over calling Steve O'Keefe 'steady'
- India vs Australia, 1st Test, Day 3: As it happened...