<< < abu und > >>
The abundance of a chemical element being lower than a reference value,
in particular compared to that of the Sun.
→ under-; → abundance.
The region on the sky covered by the plane of the → Milky Way.
It is characterized by an apparent absence of galaxies, due to the obscuring effect of
→ interstellar dust in the
→ Galactic plane.
→ zone; → avoidance.
© 2005-2022 by M. Heydari-Malayeri