A bright, circular supernova remnant set against a dark background filled with stars. The structure has a glowing, irregular shell with wisps and filaments in shades of red and orange, indicating expanding gas. The remnant is nearly symmetric, suggesting a powerful explosion at its center. Faint background stars from a Hubble image are visible beyond the nebula, adding depth to the cosmic scene.

Can a supernova explode twice? 💥
In SNR 0509-67.5, a white dwarf's surface ignites first, then triggers a second explosion deeper inside.

This remnant, captured by the Very Large Telescope, shows two shells that support the theory.

📷 ESO / NASA / Hubble
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