sci-universe:

Supernova remnant is a nebula left behind after a supernova, a spectacular explosion in which a star ejects most of its mass in a violently expanding cloud of debris. At the brightest phase of the explosion, the expanding cloud radiates as much energy in a single day as the Sun has done in the past three million years.

(Image credits: ESA/NASA/ESO/Rogelio Andreo)

(via dylanneg)

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