关于这张图
The eerie glow of a dead star, which exploded long ago as a supernova, reveals itself in this NASA Hubble image of the Crab Nebula. But don't be fooled. The ghoulish-looking object still has a pulse. Buried at its center is the star's tell-tale heart, which beats with rhythmic precision. Credits: NASA and ESA, Acknowledgment: M. Weisskopf/Marshall Space Flight Center <a href="http://go.nasa.gov/2faTQ0V" rel="nofollow">go.nasa.gov/2faTQ0V</a> Credits: NASA and ESA, Acknowledgment: M. Weisskopf/Marshall Space Flight Center <b><a href="http://www.nasa.gov/audience/formedia/features/MP_Photo_G…
