Gravitational collapse (and more specifically, core collapse) in cosmology (see also: Type II supernova)
type species | type | Type (biology) | Diabetes mellitus type 1 | Type O Negative | supernova | Diabetes mellitus type 2 | Supernova | Rock Star: Supernova | Volkswagen Type 2 | Type I and type II errors | Type 56 assault rifle | type (biology) | Type 38 | Bugatti Type 57 | Type II supernova | Type Directors Club | Type 38 rifle | type genus | Type 59 | Type 45 destroyer | Jaguar S-Type | Handley Page Type O | Geranylgeranyltransferase type 1 | Blood type | Word (data type) | urban-type settlement | Type species | Type O' Negative | Type 21 frigate |
The University of Mainz and University of Basel groups of Karl-Ludwig Kratz and Friedrich-Karl Thielemann performed a comparison between the observed abundances for the stable element europium (Z=63) and the radioactive elements thorium (Z=90) and uranium (Z=92) to the calculated abundances of an r-process in a Type II supernova explosion.
In February 1987, he came to the Cerro Tololo Inter-American Observatory and within a few days of his arrival when the Type II supernova SN1987A exploded in the Large Magellanic Cloud, he began a major campaign at CTIO to monitor this important supernova.
Comparing the observed abundances for a stable element such as Europium (Z=63) and the radioactive element Thorium (Z=90) to calculated abundances of an r-process in a type II supernova explosion (as from the universities at Mainz and Basel groups of Karl-Ludwig Kratz and Friedrich-Karl Thielemann) allowed observers to determine the age of this star to about 13 billion years.