Chandra image of SNR 0540-69.3 clearly shows two aspects of the enormous power released when a massive star explodes. An implosion crushed material into an extremely dense neutron star, triggering an explosion that sent a shock wave rumbling through space at speeds in excess of 5 million miles per hour. The image reveals a central intense white blaze of high-energy particles about 3 light years across created by the rapidly rotating neutron star, or pulsar. Surrounding the white blaze is a shell of hot gas 40 light years in diameter that marks the outward progress of the supernova shock wave. Whirling around 20 times a second, the pulsar is generating power at a rate equivalent to 30,000 Suns. This pulsar is remarkably similar to the Crab Nebula pulsar. Both are rotating rapidly, about a thousand years old, pumping out X-radiation and high-energy particles, immersed in magnetized clouds of high-energy particles with high-energy clouds surrounded by a filamentary web of cool gas. However, the extensive outer shell of 50 million degree Celsius gas in SNR 0540-69.3 has no counterpart in the Crab Nebula.