Galactic cosmic rays are high energy particles from explosive events like supernovae, zinging through our solar system, constantly bombarding both Earth and Mars. A researcher suggests they supply enough energy to make subsurface life on Mars possible. Source: https://earthsky.org/space/is-there-life-below-the-martian-surface…
Tag: supernovae
New cosmic magnetic field structures discovered in galaxy NGC 4217
Spiral galaxies such as our Milky Way can have sprawling magnetic fields. There are various theories about their formation, but so far the process is not well understood. An international research team has now analyzed the magnetic field of the Milky Way-like galaxy NGC 4217 in detail on the basis of radio astronomical observations and has discovered as yet unknown magnetic…
The Galaxy’s Brightest Explosions Go Nuclear With an Unexpected Trigger
sciencehabit writes: Type Ia supernovae, a bright and long-lasting brand of stellar explosion, play a vital role in cosmic chemical manufacturing, forging in their fireballs most of the iron and other metals that pervade the universe. The explosions also serve as “standard candles,” assumed to shine with a predictable brightness. Their brightness as seen from Earth provides a cosmic yardstick, used…
Galactic star formation and supermassive black hole masses
Astronomers studying how star formation evolved over cosmic time have discovered that quiescent galaxies (galaxies that are currently not making many new stars) frequently have active galactic nuclei. These AGN accrete material onto hot circumnuclear disks, and the resultant energy is released in bursts of radiation, or as jets of particles moving at close to the speed of light. The suspicion…
Image: Hubble views galaxy host to two supernovae
Approximately 85 million light-years from Earth, in the constellation of Libra, is the beautiful galaxy NGC 5861, captured here by the NASA/ESA Hubble Space Telescope. Source: https://phys.org/news/2020-05-image-hubble-views-galaxy-host.html…
Image: Hubble views a galaxy burning bright
In the depths of the night sky lies a barred spiral galaxy called NGC 3583, imaged here by the NASA/ESA Hubble Space Telescope. This is a barred spiral galaxy with two arms that twist out into the universe. This galaxy is located 98 million light-years away from the Milky Way. Two supernovae exploded in this galaxy, one in 1975 and another,…
Scientists reveal new insights of exploding massive stars and future gravitational wave detectors
In a study recently published in the Monthly Notices of the Royal Astronomical Society, Dr. Jade Powell and Dr. Bernhard Mueller from the ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav) simulated three core-collapse supernovae using supercomputers from across Australia, including the OzSTAR supercomputer at Swinburne University of Technology. The simulation models—which are 39 times, 20 times and 18 times…
A mystery solved? Fast Radio Burst detected within Milky Way
Fast Radio Bursts are very mysterious bursts of radio waves – perhaps just a thousandth of a second long – coming from all over the sky. This new discovery of one in our own galaxy is a stunner! Source: https://earthsky.org/space/fast-radio-burst-detected-within-milky-way…
World’s first 3-D simulations of superluminous supernovae
For most of the 20th century, astronomers have scoured the skies for supernovae—the explosive deaths of massive stars—and their remnants in search of clues about the progenitor, the mechanisms that caused it to explode, and the heavy elements created in the process. In fact, these events create most of the cosmic elements that go on to form new stars, galaxies, and…
What are gravitational waves?
First postulated by Albert Einstein in 1916 but not observed directly until September 2015, gravitational waves are ripples in spacetime. Source: https://earthsky.org/space/definition-what-are-gravitational-waves…