Glossary of Radio Astronomy Terms

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A neutron star that emits regular pulses of light towards Earth.


Protoplanetary Disk:

The swirling disk of dust and gas that collapsed from a much larger cloud of material that will eventually evolve into a fully fledged planetary system. Features in the disk may already herald the presence of young planets.


The apparent change in an object’s location due to the change in position of the observer. Astronomical parallax is measured in seconds of arc.



A unit of length that looks at the distance between earth and objects outside of our solar system. One parsec is equivalent to 3.26 light-years, or nineteen trillion miles.

Peculiar Galaxy:

A galaxy that has distorted features and does not fit completely into a normal galaxy category.

Peculiar Galaxy