On the left is a non-Earth satellite image of TRACERS-2, a spacecraft that is part of a NASA mission to study how the Sun's energy interacts with Earth's magnetic field, collected in August 2025.
Planetary defense efforts, formalized after the 1994 Comet Shoemaker-Levy 9 impact, aim to catalog and track hazardous near-Earth asteroids (NEAs) capable of causing significant damage, with mandates ...
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