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A RARE Butterfly Nebula around 200 times hotter than the Sun has left scientists puzzled.Deep in the constellation Scorpius, the nebula hides a glimps
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 was shed, enriched in carbon, forms dazzling patterns as it is blown gently into the interstellar medium.
Most planetary nebulae are roughly circular, but a few have an hourglass or wing-like shape, like the aptly named 'Butterfly Nebula'.