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1. Cygnus Loop -- Blast Wave from a Stellar Time-Bomb
High speed gas from a supernova explosion slams into dark cooler clouds of interstellar material. Shocked and heated by this tidal wave of energy, the clouds glow in bright, neon-like colors. February 1995 (altered).

2. The Cartwheel Galaxy Result of a Bull's-Eye Collision
A spectacular head-on collision between a spiral galaxy and a smaller intruder sends out a ripple of energy that triggers a firestorm of new starbirth, forming a dazzling ring-like structure. January 1995