Millions of asteroids are currently zipping through our solar system. These rocky remnants of the early solar system receive extra attention when their itinerary brings them too close to Earth—which, fortunately, astronomers can usually track in advance . But what happens if they can’t?

This could easily be the case for so-called “twilight” asteroids, whose position behind the glare of the Sun makes it tricky for astronomers to detect and track. If that wasn’t unsettling enough, the latest twilight asteroid—2025 SC79—is also the second-fastest asteroid ever identified, with an orbit of just 128 days around the Sun, according to a Carnegie Science release .

Hiding in plain sight?

Scott Sheppard, an astronomer with Carnegie Science, first observed 2025 SC79 with the Blanco 4-meter Tel

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