• Explainer: when is an asteroid a comet?

    Asteroids that look like comets might teach us more about how water came to Earth.

    The distinction between asteroids and comets used to be clear-cut.Comets were icy bodies that spent most of their...

    Astronomy October 11, 2021
  • Interstellar comets are more common than thought

    “We’re finding that there could be substantially more visitors,” say Harvard scientists

    Two years ago, astronomers detected an extraterrestrial visitor to our solar system – a rogue comet called 2I/Borisov...

    Astronomy August 23, 2021
  • 2I/Borisov: Interstellar interloper

    New comet is only the second ever interstellar visitor detected entering our solar system.

    It’s only the second interstellar visitor a telescope on our planet has ever recorded (pipped to the post by Oumuamua...

    Astronomy March 31, 2021
  • Comet action caught in close up

    Images reveal striking details of recent visitor’s rotation.

    Comet NEOWISE (C/2020 F3) is the current darling of the skies and it’s been putting on quite a show. When it sped thr...

    Astronomy August 26, 2020
  • SOHO keeps on doing the business

    It’s watching the Sun and finding comets. Lots of comets.

    SOHO – the Solar and Heliospheric Observatory – doesn’t have quite the profile of the likes of Hubble and Spitzer, bu...

    Astronomy June 27, 2020
  • 2I/Borisov is not your average comet

    Two new views on our interstellar visitor.

    The interstellar comet 2I/Borisov contains an abundant amount of carbon monoxide and is likely to have formed in a co...

    Astronomy April 21, 2020
  • Borisov makes a flying visit

    Hubble captures speedy comet heading back into interstellar space.

    The NASA/ESA Hubble Space Telescope has made two new observations of Comet 2I/Borisov – only the second interstellar ...

    Space December 15, 2019
  • Fireball over SA could have been a “Minimoon”

    Minimoon spotted as it exploded in the atmosphere in 2016.

    Rocks explode in Earth’s atmosphere fairly regularly, and at first glance a bolide spotted over South Australia in 20...

    ASC Edits December 3, 2019
  • Partner Content

    Eta Aquariid meteor shower lights up sky

    Remnants from Halley’s Comet will provide a spectacular show.

    Amateur astronomers across Australia will be treated to shooting stars over the next few days, as bits of rock and ic...

    ASC Edits May 7, 2019
  • Violent collision could have made comet in just hours

    New modelling challenges accepted theories on how well-known comet formed. Andrew Masterson reports.

    The comet 67P/Churyumov–Gerasimenko, or “Chury” for short, may have been formed from a violent collision between two ...

    Space March 12, 2018
  • Why comets have oxygen atmospheres

    A chemical engineer has used his work with semiconductors to explain a mystery that has puzzled s...

    Comet 67P/Churyumov–Gerasimenko, as seen by Rosetta.ESA/Rosetta/NAVCAMWhy would a comet have oxygen in its atmosphere...

    Space May 8, 2017
  • Signs of comet collision found in 55-million-year-old rocks

    Back then, Earth was warmer than it is today – perhaps triggered by a heavenly body crashing into...

    Glass blobs in rocks found along the US east coast point to a comet collision a few million years ago.Marc Ward / Sto...

    Earth Sciences October 13, 2016
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