One of these was observed in 1054 by the Chinese and left behind the Crab Nebula.
These events greatly increase the ambient neutron flux, causing the time scale for an element to capture a neutron to be much shorter than the time scale for it undergoing beta decay, and unlocking the r-process. One type of these events is classified based on the presence of the singly-ionized silicon line and can be used as a standard candle; that is type Ia. Several types are caused by the fact that the binding energy of iron-56 prevents fusion from occurring, thus leading to its accumulation and an eventual core-collapse. One of these was observed in 1054 by the Chinese and left behind the Crab Nebula. For 10 points, name these massive stellar explosions.
These events greatly increase the ambient neutron flux, causing the time scale for an element to capture a neutron to be much shorter than the time scale for it undergoing beta decay, and unlocking the r-process.
supernova