Galactic radio sources, as their name implies, are objects within
the Milky Way Galaxy that emit radiation that can be detected at
radio wavelengths. These sources include relatively young objects:
stars like our Sun; ionized hydrogen or HII regions, which often
surround massive stars embedded in dense clouds; and warm dust
heated by newly formed stars. Galactic radio emission also comes
from the remnants of stars at or near the ends of their lives:
planetary nebulae - expanding shells of debris from low-mass stars
(so named because they resemble planets in small optical
telescopes); supernovae & supernova remnants - clouds of gas and
dust created when massive stars explode; pulsars, neutron stars &
black holes -
extremely dense stellar remnants formed after a supernova explosion.
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