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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
NASA's Chandra finds 84 mysterious "hypersoft" x-ray objects across 6 galaxies — But what are they?
4+ hour, 41+ min ago (346+ words) NASA’s Chandra X-ray Observatory has spotted 84 mysterious objects across six galaxies that are leaving astronomers with a major question. What are they? The objects give off unusually low-energy X-rays. Yet they also appear to produce powerful ultraviolet radiation. This strange…...
A New Catalog of Close to 3,000 Supernova Challenges Theories on Dark Energy
7+ hour, 20+ min ago (88+ words) The most comprehensive catalogue of exploding white dwarf stars ever assembled has revealed new clues about dark energy, the mysterious force driving the universe’s accelerating expansion....
A molecular-hydrogen cloud only 300 light-years away spans roughly 40 full-Moon widths across our sky, yet astronomers did not identify it until 2025. Named Eos, it escaped conventional surveys because they search for molecular hydrogen indirectly through carbon monoxide—and almost all of Eos is CO-dark.
8+ hour, 44+ min ago (858+ words) Eos covers about 20 degrees of sky, but almost all its estimated 3,400 solar masses of molecular hydrogen escaped the carbon-monoxide surveys normally used to find such clouds....
Is This the First Exomoon
2+ day, 16+ hour ago (1676+ words) For decades, astronomers have been looking for moons beyond our Solar System. Several exomoon candidates have been proposed, but none has become an unambiguous, confirmed example. In a recent SETI Live conversation, host Dr. Franck Marchis spoke with Universidad Diego…...
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…...
Before MeerKAT, South Africa's Karoo telescope had its own ways of reading the stars
19+ hour, 7+ min ago (1012+ words) Around the SKA telescope, old star stories survive through practical knowledge, new meanings and changing community traditions. (CREDIT: Shutterstock) Long before enormous radio dishes began rising from South Africa’s Karoo, people there were already watching the sky. They used celestial…...
‘Odd couple’ black holes can find each other in space
2+ day, 5+ hour ago (477+ words) When two black holes find each other in the vastness of space, they can form a binary odd couple—and it’s more common than researchers expected. Scientists think most black holes are born when a star dies and its core…...
Help Refine Data from Space Telescopes with Artifact InSPECtor
1+ day, 13+ hour ago (186+ words) How do scientists studying space with data from a telescope hundreds of thousands of miles away know that what they are seeing is real? A new NASA project, Artifact InSPECtor, invites you to find out – and by doing so, to…...