The largest comet ever found has jets of carbon monoxide gas erupting from its 85-mile (140-kilometer) wide nucleus. Comet Bernardinelli-Bernstein (C/2014 UN271) was studied while it was more than halfway to Neptune using a radio telescope array in Chile’s Atacama desert. It will enter the inner solar system in 2031, but it won’t come as close to the sun as Earth.
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