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4Astronomy is a search engine built for people who look up. We combine multiple indexes, curated astronomy sources, and AI systems to return results tailored to astronomy topics. Use 4Astronomy to find observing guides, research papers, image archives, mission information, community resources, and products relevant to amateur and professional astronomy. Part of the 4SEARCH network of topic specific search engines.
Latest Articles
Einstein Probe X-Ray Flash: What Powered This Supernova?
58+ min ago (476+ words) A sub-threshold Einstein Probe X-ray flash was found after ZTF spotted supernova SN 2025wkm. Researchers link the signal to shock breakout and a possible magnetar-powered engine. EP250827b was a soft X-ray flash that lasted more than 1,000 seconds. Spectral fits put its peak…...
What if dark energy is evolving? Comprehensive new dataset questions a core assumption
5+ hour, 2+ min ago (411+ words) starlust.org What if dark energy is evolving? Comprehensive new dataset questions a core assumption For the first time, astronomers have assembled a catalog containing nearly 3,000 exploding stars. And now, all those stars are pointing them toward something they weren’t…...
New simulations suggest the moon formed just 5 hours after Earth slammed into protoplanet Theia
3+ hour, 39+ min ago (552+ words) Earth's moon may have formed far faster than scientists once believed, with new simulations suggesting it came together in as little as five hours after a catastrophic collision. That unexpectedly short timeline could reshape researchers' understanding of one of the…...
Known physics suggests the early universe should have produced matter and antimatter in equal amounts. Nearly all of it annihilated into radiation, but roughly one extra matter particle survived for every billion pairs—and why that tiny imbalance existed remains one of physics’ deepest unsolved problems.
6+ hour, 44+ min ago (906+ words) The measured net baryon-to-photon ratio is about 6.1 parts in ten billion. Physics can describe the required ingredients for that excess, but no confirmed mechanism made it....
Time travel does not exist and never will: Understanding Time
3+ hour, 3+ min ago (670+ words) I exist in the present.Continue reading on Medium » Time travel does not exist and never will: Understanding Time I exist in the present. ● Time is in the present. No movement forward or backward in time. Time is not a…...
Scientists Detect a Mysterious Signal That Could Be Dark Matter
18+ hour, 52+ min ago (509+ words) A mysterious signal deep underground may offer LUX-ZEPLIN its most intriguing clue to dark matter yet. For nearly a century, scientists have been trying to identify dark matter, the mysterious material believed to account for about 85% of all matter in…...
Physicists Just Turned The Entire Planet Into a Dark Matter Detector – And Strange Signals Kept Turning Up
13+ hour, 14+ min ago (218+ words) Physicists have conducted a worldwide hunt for dark matter....
beyond the last observer
11+ hour, 28+ min ago (443+ words) Something can happen without anyone witnessing it.. A star can collapse in a distant galaxy with no observer present, Its light can travel across the universe for billions of …...
Scientists Forced Water Into a Bizarre New State of Matter That May Explain Uranus and Neptune’s Strange Mgnetic Fields
14+ hour, 59+ min ago (575+ words) What happens to water when the usual rules no longer seem to apply? Scientists have recreated extraordinary conditions in the lab, uncovering a state of matter that could be hiding deep inside distant planets. Scientists have created a bizarre type…...