31. Cosmic Catastrophes : Supernovae , Gamma-ray Bursts and Adventures in Hyperspace. 32. Less common are Type II-L supernovae that lack a distinct plateau. 33. These two processes are responsible for the electromagnetic radiation from Type Ia supernovae . 34. Resolution of these uncertainties requires the analysis of more supernovae and supernova remnants. 35. Two types of stars explode as supernovae : white dwarfs and massive stars. 36. Type Ib supernovae lack hydrogen lines in their spectra. 37. Type Ia supernovae are some of the best ways to determine extragalactic distances. 38. The first recorded observations of solar eclipses and supernovae were made in China. 39. Pontecorvo also predicted in 1958 that supernovae would produce intense bursts of neutrinos. 40. This continuum is primarily composed of synchrotron radiation produced by Type II supernovae .
