such as "Introduction", "Conclusion"..etc
Hubble Finds That Earth Is Safe From One Class Of Gamma-ray Burst
This is a sampling of the host galaxies of long-duration gamma-ray bursts taken by NASA's Hubble Space Telescope. Gamma-ray bursts are powerful flashes of high-energy radiation that arise from some supernovae, the explosive deaths of extremely massive stars. Long-duration bursts last more than one to two seconds. (Credit: NASA, ESA, Andrew Fruchter (STScI), and the GRB Optical Studies with HST (GOSH) collaboration)
Source: Space Telescope Science Institute, May 10, 2006
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