ScienceSpace DailyA Quebec amateur astronomer was scouting a campsite using satellite imagery in 2024 when he spotted a 25-kilometre ring around Lake Marsal, and geologists who reached it by floatplane the following ye
A Quebec amateur astronomer spotted a 25-kilometre ring in satellite imagery while planning a camping trip, and geologists confirmed it is an ancient impact crater.
A casual glance at satellite imagery revealed what geologists had missed for nearly 400 million years: evidence of an ancient cosmic collision hidden in plain sight beneath Quebec's forests.
An amateur astronomer in Quebec noticed a nearly circular 25-kilometre ring of ridges around Lake Marsal in satellite imagery and reported it to a university research group.
A team of four researchers flew in by floatplane in October 2025 and waded through 50 metres of water to reach the site, where they found shatter cones confirming an ancient cosmic impact.
Planetary geologist Gordon Osinski described the expedition as one of the most arduous he had ever done, across a career spanning six continents and the Arctic.
The discovery was made possible by a public reporting channel run by Western University called Impact Earth, which anyone can submit unusual geological finds to.
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