Often a phrase is used to help remember the order of the groups of the electromagnetic spectrum such as Roman Men Invented Very Unusual X-ray Guns. Each group contains a range of frequencies.

And new research suggests the mechanism creating these jets may be the same for these objects at opposite ends of the astrophysical spectrum ... a helix-shaped magnetic field within a protostellar ...

Electromagnetic waves can be separated into seven distinct groups in the spectrum. Each group contains a range of frequencies. For example, visible light contains all the frequencies that can be ...