The cryovolcanic "centaur" comet 29P/Schwassmann-Wachmann has erupted four times in less than 48 hours, becoming unusually bright in the process. It is the most powerful outburst from the city ...

However, 29P is also part of an even rarer group, known as cryovolcanic, or cold volcano, comets. Cryovolcanic comets consist ...