Radiation should be able to deflect asteroids as large as 4 km across
Briefly

The idea that nuclear weapons could effectively destroy asteroids might be misleading. Instead, vaporizing asteroid surfaces can create a temporary atmosphere to redirect their paths.
Using the Z machine at Sandia National Lab, researchers aim to simulate nuclear radiation that could potentially deflect asteroids, showcasing a unique application of nuclear technology.
Read at Ars Technica
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