Here is a list of the most energetic events in the universe, arranged in order. Please note that the ordering of these events can vary depending on specific criteria used, such as total energy released, peak luminosity, or different types of radiation considered. The references provided should offer comprehensive information on each topic.
The Most Energetic Events in the Universe
- Gamma-Ray Bursts (GRBs)
- Supermassive Black Hole Accretion
- Supernovae
- Quasar Outbursts
- Cosmic Rays
Gamma-Ray Bursts (GRBs): GRBs are the most energetic explosions in the universe. They release an enormous amount of gamma-ray radiation in a short period, typically lasting from milliseconds to minutes. GRBs are associated with the collapse of massive stars or the merger of neutron stars. They can outshine the entire universe for a brief moment.
- Long-duration GRBs: These events typically last for more than two seconds and are associated with the collapse of massive stars, specifically those that have exhausted their nuclear fuel and undergone a supernova explosion. They are commonly found in galaxies that are actively forming stars. They are associated with massive stars, particularly those with masses greater than about 10 times that of the Sun. These stars go through a core collapse, resulting in the formation of a black hole or a rapidly spinning neutron star (a pulsar).
- Short-duration GRBs: These events last for less than two seconds and are believed to be caused by the merger of compact objects such as neutron stars or black holes. Their exact progenitors are not yet fully understood. The leading hypothesis is that they are caused by the merger of compact objects, such as two neutron stars or a neutron star and a black hole.
Once a burst is detected, ground-based telescopes rapidly slew to the burst location to observe the afterglow emission across different wavelengths. This follow-up allows for a detailed study and characterization of GRBs. GRBs are important probes of the early universe.
They have been observed at extremely high redshifts, indicating that they occurred when the universe was much younger. The association of long-duration GRBs with massive stars has provided valuable insights into stellar evolution, supernova mechanisms, and the formation of black holes.
Supermassive Black Hole Accretion: When matter falls into supermassive black holes at the centers of galaxies, it releases an enormous amount of energy. The gravitational potential energy is converted into radiation and jets of high-energy particles. This process is known as accretion.
Now these accretion disks are some of the most uninviting, violent places in the known Universe, with velocities approaching the speed of light, and temperatures far in excess of the surface of our Sun.
This heat produces radiation which we see as light, but the conversion of heat to light is so efficient—about 30 times more efficient than nuclear fusion—that physicists don’t quite understand how.
Supernovae: Supernovae are catastrophic explosions that occur at the end of the life of massive stars. The energy released during a supernova is equivalent to the output of billions of stars for a brief period. They are responsible for the creation of heavy elements and can briefly outshine entire galaxies. Astronomers believe that about two or three supernovas occur each century in galaxies like our own Milky Way.
Because the universe contains so many galaxies, astronomers observe a few hundred supernovas per year outside our galaxy. Space dust blocks our view of most of the supernovas within the Milky Way. NASA scientists use a number of different types of telescopes to search for and then study supernovas. One example is the NuSTAR (Nuclear Spectroscopic Telescope Array) mission[3], which uses X-ray vision to investigate the universe. NuSTAR is helping scientists observe supernovas and young nebulas to learn more about what happens leading up to, during, and after these spectacular blasts.
Quasar Outbursts: Quasars are the extremely bright cores of distant galaxies, powered by accretion onto supermassive black holes. Occasionally, these black holes experience outbursts, emitting enormous amounts of energy and matter in the form of powerful jets.
These outbursts can last for millions of years and are among the most energetic events in the universe. Quasar Outbursts are a phenomenon where dust and gas fall into a supermassive black hole, forming jets above and below the black hole. Quasars are very bright galaxies that host a supermassive black hole with a mass of hundreds of millions of suns.
The source of a quasar is an active galactic nucleus fueled by a supermassive black hole. The brightest quasars can outshine all of the stars in the galaxies in which they reside, making them visible even at distances of billions of light-years.
Cosmic Rays: Cosmic rays are high-energy particles, mainly protons and atomic nuclei, that travel through space at near-light speeds. They are believed to originate from various astrophysical sources, such as supernova remnants, active galactic nuclei, and gamma-ray bursts. Cosmic rays can have energies in the range of trillions of electron volts (TeV) and are among the most energetic particles in the universe.
Discovered in 1912, many things about cosmic rays remain a mystery more than a century later. One prime example is exactly where they are coming from. Most scientists suspect their origins are related to supernovas (star explosions), but the challenge is that for many years cosmic ray origins appeared uniform to observatories examining the entire sky.
We know today that galactic cosmic rays are atom fragments such as protons (positively charged particles), electrons (negatively charged particles), and atomic nuclei. While we know now they can be created in supernovas, there may be other sources available for cosmic ray creation. It also isn’t clear exactly how supernovas are able to make these cosmic rays so fast.
Cosmic rays constantly rain down on Earth, and while the high-energy “primary” rays collide with atoms in the Earth’s upper atmosphere and rarely make it through to the ground, “secondary” particles are ejected from this collision and do reach us on the ground.
But by the time these cosmic rays get to Earth, it’s impossible to trace where they came from. That’s because their path has been changed as they traveled through multiple magnetic fields (the galaxies, the solar system, and Earth itself.)
Footnotes
- NASA’s Fermi Gamma-ray Space Telescope, launched in 2008, is a space observatory designed to study gamma-ray emissions from various astrophysical sources, including gamma-ray bursts (GRBs), active galactic nuclei (AGNs), pulsars, and supernova remnants. It carries two main instruments: the Large Area Telescope (LAT) and the Gamma-ray Burst Monitor (GBM). The LAT is an imaging detector that provides precise localization and energy measurements of gamma rays in the energy range from 20 MeV to more than 300 GeV, allowing for detailed studies of cosmic gamma-ray sources. The GBM, on the other hand, is a scintillation detector that detects gamma-ray bursts and provides a broad view of the gamma-ray sky, covering a wider energy range from 8 keV to 40 MeV. By observing the high-energy gamma-ray universe, Fermi has contributed significantly to our understanding of various astrophysical phenomena and played a crucial role in the field of gamma-ray astronomy. [Back]
- The European Space Agency’s International Gamma-Ray Astrophysics Laboratory (INTEGRAL) is a space observatory dedicated to studying gamma-ray emissions in the universe. Launched in 2002, INTEGRAL carries a suite of instruments that allow it to observe gamma rays with energies ranging from 15 keV to 10 MeV. The main instruments onboard INTEGRAL include the spectrometer SPI, the imager IBIS, the X-ray monitor JEM-X, and the optical monitor OMC. These instruments enable INTEGRAL to detect and characterize a wide range of high-energy phenomena such as gamma-ray bursts, active galactic nuclei, supernova remnants, and cosmic accelerators. The mission has contributed significantly to our understanding of gamma-ray sources and their role in astrophysics. [Back]
- NuSTAR (Nuclear Spectroscopic Telescope Array) is a space-based observatory launched by NASA in 2012, designed to study the universe in high-energy X-rays. It is the first telescope capable of focusing these X-rays to produce sharp images, enabling detailed investigations of cosmic sources such as black holes, supernovae remnants, and active galactic nuclei. NuSTAR operates in the energy range of 3 to 79 keV, which allows it to capture X-rays with higher energies than previous missions. With its advanced focusing capabilities, NuSTAR provides unprecedented sensitivity and resolution in the hard X-ray band, offering unique insights into the high-energy processes occurring in the universe. [Back]
Further Reading
Sources
- “This Is the Most Powerful Event Possible in the Universe” (Mar 13, 2021) https://medium.com/predict/this-is-the-most-powerful-event-possible-in-the-universe-5c81d9953f83
- “What Is a Supernova?” https://spaceplace.nasa.gov/supernova/en/
- “Quasar outburst revises understanding of universe, quasars” (December 15, 2015) https://source.wustl.edu/2015/12/quasar-outburst-revises-understanding-of-universe-quasars/
- “What are cosmic rays?” (May 13, 2022) https://www.space.com/32644-cosmic-rays.html
- NASA. (n.d.). Nuclear Spectroscopic Telescope Array (NuSTAR). Retrieved from https://www.nasa.gov/mission_pages/nustar/main/index.html
- ESA Science & Technology. (n.d.). INTEGRAL. Retrieved from https://www.cosmos.esa.int/web/integral
- NASA. (n.d.). Fermi Gamma-ray Space Telescope. Retrieved from https://fermi.gsfc.nasa.gov/
- Zhang, B. (2011). Gamma-ray bursts: progress, problems & prospects. Comptes Rendus Physique, 12(3), 206-220.
- Gehrels, N., et al. (2009). The Swift Gamma-Ray Burst Mission. The Astrophysical Journal, 611(2), 1005-1020.
- Kouveliotou, C., et al. (2012). Gamma-ray bursts. Advances in Space Research, 49(2), 185-194.
- Piran, T. (2004). The physics of gamma-ray bursts. Reviews of Modern Physics,
