Nebulae
type: Concept
narrower: Supernova remnants

Interstellar medium
type: Concept
narrower: Supernova remnants

Supernova remnants
definition: The body of expanding gas ejected at a speed of about 10,000 km s^-1 by a supernova explosion, observed as a diffuse gaseous nebula, often with a shell-like structure. Supernova remnants are generally powerful radio sources. The evolution of the SNR can be divided into different phases according to the dominant physical processes. Simplified models are made for the first stages, to get an idea of typical time scales, expansion velocities, and sizes. The three main phases are: 1) the free expansion phase, 2) the Sedov-Taylor phase, and 3) the snowplow phase.
type: Concept
broader: Interstellar medium
broader: Nebulae
modified: 2020-11-04T19:00:40.701Z
modified: 2020-11-04T19:00:25.918Z
narrower: Pulsar wind nebulae
contributor: AAS Frey.Katie Admin

Pulsar wind nebulae
type: Concept
broader: Supernova remnants