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The bubble-shaped remnant of SN 1006, a type 1a supernova, reveals that two white dwarf stars probably triggered the massive stellar explosion. Credit: X-ray: NASA, CXC, G. Cassam-Chenaï and J. Hughes et al/Rutgers Univ.; Radio: NRAO, AUI, NSF, GBT, K. Dyer, R. Maddalena and T. Cornwell/VLA; Optical: F. Winkler/Middlebury College, NOAO, AURA, NSF, CTIO, Schmidt/DSS

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