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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
Venus Aerospace Opens New Test Site At Houston Spaceport
2+ hour, 38+ min ago (279+ words) Sun, Sep 13, 2026 Venus Aerospace, a rocket propulsion startup, unveiled its new test stand at the Houston Spaceport on Thursday. The Houston-based company specializes in improvements to rocket engines and propulsion. The new facility develops rotating detonation rocket engines (RDRE), which…...
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.
33+ min 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....
NASA's Chandra finds 84 mysterious "hypersoft" x-ray objects across 6 galaxies??? But what are they?
4+ hour, 41+ min ago (15+ words) NASA's Chandra finds 84 mysterious "hypersoft" x-ray objects across 6 galaxies — But what are... Moneycontrol.com...
More than 6,000 exoplanets confirmed in the Milky Way, including rocky worlds
2+ hour, 3+ min ago (290+ words) More than 6,000 exoplanets have been confirmed in the Milky Way, including terrestrial worlds that may be composed mainly of rock and metal. The NASA Exoplanet Archive listed 6,366 confirmed planets as of September 11, 2026, along with thousands of additional candidates awaiting verification....
Before moon landing, astronauts learned geology in Arizona
1+ day, 21+ hour ago (81+ words) FLAGSTAFF, Ariz. (AP) — Before Neil Armstrong and Buzz Aldrin knew they would be the first to walk on the moon, they took crash courses in geology at the Grand Canyon and a nearby impact crater that is the most well-preserved…...
NASA's Curiosity discovers strange holes on Mount Sharp of Mars: a geological enigma with no clear explanation
1+ day, 10+ hour ago (350+ words) A recent discovery by the Curiosity rover from NASA has captured the attention of scientists worldwide. While exploring the Valley Grande on Mount Sharp on Mars, the vehicle found a series of geological enigmas: holes and cavities that challenge conventional…...
# 🚀🔵🔴 ROCKET LAB vs BLUE ORIGIN ## EPISODE 5
7+ hour, 26+ min ago (1621+ words) 🚀🔵🔴 ROCKET LAB vs BLUE ORIGIN THE RACE TO BUILD DEEP SPACE INFRASTRUCTURE EPISODE 5 | BEZOS CAPITAL vs BECK CAPITAL EFFICIENCY In the space industry, does the company with the most money ultimately win? Episode 4 ended with an uncomfortable but straightforward conclusion....
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…...
China could beat Nasa to return first Mars samples by 2031
3+ hour, 37+ min ago (559+ words) Sunday September 13, 2026 China is aiming to bring about 500 grams of Martian material back to Earth by 2031, potentially beating Nasa in the race to return the first samples from Mars, as the US space agency currently has no clear plan or…...
NASA Space Apps Challenge Opens Call in Costa Rica for Participants Without Prior Tech Experience ⋆ The Costa Rica News
3+ hour, 4+ min ago (258+ words) SAN JOSÉ, COSTA RICA — Is it possible to participate in a prestigious international challenge backed by NASA without being a programmer, engineer, or aerospace specialist? In Costa Rica, the answer is a resounding yes. The NASA Space Apps Challenge 2026 has…...