The star at the center of our solar system. It is made mostly of hydrogen and helium with traces of heavier elements. Sunspots Temporary magnetic disturbances in the photosphere. They appear dark because temperatures are considerably lower than in surrounding areas. The death explosion of a massive star whose core has completely burned out.
Supernova explosions can temporarily outshine a galaxy.
The outer layers are blasted out in an expanding cloud. Supersonic Faster than the speed of sound. T Telemetry Radio signals to and from a spacecraft used to encode and exchange data with a ground station. An analysis of a set of facts in their relation to one another, offered to explain events. An instrument system that uses the difference in travel time through a chamber to separate particles or photons with differing properties.