Astronomy Cast Full Raw Feed · Fraser Cain & Dr. Pamela L. Gay

Ep. 745: How We Know If Asteroids Will Attack

·58 min·5 clips

Astronomers eliminate safe orbits when they can't find asteroids in archival data, raising impact chances unexpectedly.

The feed starts messy. A live recording check slides into lighting talk: camera sensitivity, reflective setups, ISO settings, shutter speed, and a producer conversation still waiting offstage. Then the asteroid episode properly begins. The useful question is blunt: when an asteroid lands on the risk list, how worried should anyone be? YR4 is the example. It is sitting at a reported 1.5 percent impact chance, enough to watch closely, not enough to spiral. The Torino scale gives the hosts a plain way to sort that risk. Objects bigger than about 20 meters can be ranked if they have some chance of hitting Earth, and the rank can move as new observations tighten the orbit. Apophis is the cautionary memory, once at level four before settling back to zero. James Webb enters because Andy Rivkin and his team have telescope time to measure YR4 and clean up the orbit. Better data does the real work here. The hosts expect the risk to drop as observations improve, but they do not treat mitigation like fantasy. If the odds rose, space agencies could consider a DART-style impact to nudge the path. DART matters because it proved a heavy object can hit a space rock and change its orbit. Its build-to-launch timeline of about three years matters too. Timing is part of the math. The tone stays steady, then closes on worries about federal government job losses and shrinking funding opportunities, with a promise to keep reporting carefully as the facts firm up.

As heard by us

A steady YR4 primer that keeps the uncertainty grounded.

This episode handles the YR4 question with care. The hosts move from orbit refinement to size estimates to the Torino scale, and they keep the uncertainty plain rather than dramatic.

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Why you'd press play

Want the plain-English read on why this asteroid is still sitting at Torino scale 3?

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