A theoretical astrophysicist may have solved a nearly two-decade-old mystery over the origins of an unusual 'zebra' pattern seen in high-frequency radio pulses from the Crab Nebula. A theoretical ...
Planetary nebulae form when red giant stars expel their outermost layers as they run out of helium fuel — becoming hot, dense white dwarf stars that are roughly the size of Earth. The material that ...
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