An artist’s impression of interstellar object `Oumuamua, assuming it’s a rock. ESO/M. Kornmesser, CC BY

Comet or asteroid? Mysterious ‘Oumuamua shows why we may need a new classification system

Comet or asteroid? Mysterious ‘Oumuamua shows why we may need a new classification system Artist’s impression of the interstellar object. ESO/M. Kornmesser, CC BY Monica…

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shows the progression of NASA's Near-Earth Object Wide-field Survey Explorer (NEOWISE) investigation for the mission's first four years following its restart in December 2013. Green dots represent near-Earth objects. Gray dots represent all other asteroids which are mainly in the main asteroid belt between Mars and Jupiter. Yellow squares represent comets. Credits: NASA/JPL-Caltech/PSI

NASA’s NEOWISE Asteroid-Hunter Spacecraft — Four Years of Data

NASA’s NEOWISE Asteroid-Hunter Spacecraft — Four Years of Data NASA’s Near-Earth Object Wide-field Infrared Survey Explorer (NEOWISE) mission has released its fourth year of survey…

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An illustration of ‘Oumuamua, the first object we’ve ever seen pass through our own solar system that has interstellar origins. Credits: European Southern Observatory/M. Kornmesser

New Study Shows What Interstellar Visitor ‘Oumuamua Can Teach Us

New Study Shows What Interstellar Visitor ‘Oumuamua Can Teach Us The first interstellar object ever seen in our solar system, named ‘Oumuamua, is giving scientists…

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Blue light from a newborn star lights up the reflection nebula IC 2631. This nebula is part of the Chamaeleon star-forming region, which Webb will study to learn more about the formation of water and other cosmic ices. Credits: European Southern Observatory (ESO)

NASA’s Webb Telescope to Make a Splash in Search for Interstellar Water

NASA’s Webb Telescope to Make a Splash in Search for Interstellar Water Water is crucial for life, but how do you make water? Cooking up…

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The comet 67P/Churyumov-Gerasimenko, seen up close. ESA/Rosetta/NavCam, CC BY-SA

How comet dust has allowed us to trace the history of the Solar System

How comet dust has allowed us to trace the history of the Solar System The comet 67P/Churyumov-Gerasimenko, seen up close. ESA/Rosetta/NavCam, CC BY-SA Donia Baklouti, Université Paris…

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The 2017 Geminids as seen from Ecuador, against the backdrop of the splendid Milky Way (centre) and the Large Magellanic Cloud (right). Flickr/David Meyer, CC BY-NC-ND

Look up! Your guide to some of the best meteor showers for 2018

Look up! Your guide to some of the best meteor showers for 2018 The 2017 Geminids as seen from Ecuador, against the backdrop of the…

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ESO/M. Kornmesser, CC BY-SA

Mysterious alien cigar ‘asteroid’ is actually an interstellar lump of ice (not a space ship)

Mysterious alien cigar ‘asteroid’ is actually an interstellar lump of ice (not a space ship) ESO/M. Kornmesser, CC BY-SA Alan Fitzsimmons, Queen’s University Belfast The…

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Comet 45P/Honda-Mrkos-Pajdušáková is captured using a telescope on December 22 from Farm Tivoli in Namibia, Africa. Credits: Gerald Rhemann

NASA Telescope Studies Quirky Comet 45P

NASA Telescope Studies Quirky Comet 45P When comet 45P zipped past Earth early in 2017, researchers observing from NASA’s Infrared Telescope Facility, or IRTF, in…

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This artist’s impression shows the first interstellar asteroid: `Oumuamua. This unique object was discovered on 19 October 2017 by the Pan-STARRS 1 telescope in Hawai`i. Subsequent observations from ESO’s Very Large Telescope in Chile and other observatories around the world show that it was travelling through space for millions of years before its chance encounter with our star system. `Oumuamua seems to be a dark red highly-elongated metallic or rocky object, about 400 metres long, and is unlike anything normally found in the Solar System. Credits: European Southern Observatory/M. Kornmesser

Solar System’s First Interstellar Visitor Dazzles Scientists

Solar System’s First Interstellar Visitor Dazzles Scientists Astronomers recently scrambled to observe an intriguing asteroid that zipped through the solar system on a steep trajectory…

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Artist’s impression of the enigmatic space rock. ESO/M. Kornmesser, CC BY-SA

Discovery of cigar-shaped asteroid from outer space could help unveil secrets of extrasolar worlds

Discovery of cigar-shaped asteroid from outer space could help unveil secrets of extrasolar worlds Artist’s impression of the enigmatic space rock. ESO/M. Kornmesser, CC BY-SA…

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Tiny and very faint, this fast moving object (centre) was captured by astronomers as it passed through our Solar system. Queen's University Belfast

A fleeting visit: an asteroid from another planetary system just shot past Earth

A fleeting visit: an asteroid from another planetary system just shot past Earth Tiny and very faint, this fast moving object (centre) was captured by…

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image credit: R. Stoyan et al., Atlas of the Messier Objects: Highlights of the Deep Sky (Cambridge University Press, 2008)

New Hubble Gallery Features Objects from Popular Not-a-Comet Messier Catalog

New Hubble Gallery Features Objects from Popular Not-a-Comet Messier Catalog In a nod to the global amateur astronomy community, as well as to any space…

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