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Space News from SpaceDaily.Com brings the space industry professional daily news from the frontier, with contract, bid, launch and on-orbit satellite news as it happens.
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On 31 January 1958, Explorer 1, America’s first satellite, began returning a baffling pattern from its Geiger counter: ordinary cosmic-ray counts followed by unexplained zeros. Van Allen’s team suspected the instrument was not failing but saturating under radiation too intense to register; two months later, Explorer 3’s complete recordings confirmed that the apparent silence marked a vast radiation belt surrounding Earth—the first of the belts now bearing Van Allen’s name.
1+ day, 6+ hour ago (515+ words) Explorer 1’s zero counts proved to be detector overload, and Explorer 3’s continuous record exposed the first of Earth’s Van Allen radiation belts....
Physicist Bhupal Dev at Washington University used the debris from GW170817 — the 2017 neutron star merger — to squeeze new limits on axion-like particles, treating the hot post-collision remnant as a natural forge for dark-matter candidates
5+ day, 2+ hour ago (302+ words) Physicist Bhupal Dev and colleagues have used the multi-year record of GW170817 — the 2017 neutron star merger seen in both gravitational waves and light — to tighten bounds on axion-like particles, treating the hot post-collision remnant as a natural forge for dark matter…...
Astronomers long expected the Milky Way and Andromeda to collide in about 4.5 billion years — but a 2025 study in Nature Astronomy, using Hubble and Gaia data, estimated only a roughly 50–50 chance of the galaxies merging within the next 10 billion years.
1+ week, 11+ hour ago (810+ words) The 2025 estimate depended on uncertain motions and neighbouring galaxies. A 2026 follow-up put the merger probability higher, showing why the forecast remains sensitive to the measurements. By Deep Field · Edited by Lachlan Brown Published September 7, 2026 · How we edit The Milky Way’s…...
ESO’s new MOONS spectrograph on the Very Large Telescope took first light able to watch about 1,000 cosmic targets at once through roughly 1,000 fibers, built to map millions of objects over its working life
1+ week, 11+ hour ago (30+ words) For the first time, astronomers can map the cosmos in bulk, capturing the light signatures of a thousand distant objects at once to unlock the history of billions of galaxies....
Three supermassive black holes have been found packed into a galaxy that existed just 1.2 billion years after the Big Bang — an ancient cosmic pile-up that may explain how the early universe produced such enormous monsters before it had much time to do so
2+ week, 6+ hour ago (658+ words) The discovery of three feeding black holes in an infant galaxy offers astronomers a rare glimpse into how the universe assembled its most massive monsters before it had time to build them. Published August 31, 2026 · How we edit Most galaxies get…...
The universe’s total mass-energy budget, according to standard cosmology: 4.9% ordinary matter, 26.8% dark matter and 68.3% dark energy — meaning everything made from the atoms on the periodic table accounts for less than one-twentieth of the cosmos.
2+ week, 1+ day ago (1022+ words) Planck's 2013 universe inventory assigned 4.9% to ordinary matter, 26.8% to dark matter and 68.3% to dark energy, within the standard flat ΛCDM model....
JWST found an object in the early universe whose dense hydrogen cocoon made it look eerily like an enormous star — until astronomers realized it was radiating roughly 100 billion times the Sun's luminosity, with a growing black hole hidden inside.
3+ week, 3+ day ago (317+ words) MoM-BH*-1's extreme Balmer break shows how dense hydrogen can reprocess an accreting black hole's light into a spectrum with the outward appearance of an enormous star....