MACHO

 
Pronunciation: /ˈmatʃəʊ/

noun

Astronomy
  • a relatively dark, dense object, such as a brown dwarf, a low-mass star, or a black hole, of a kind believed to occur in a halo around a galaxy and to contain a significant proportion of the galaxy’s mass.

Origin:

1990s: acronym from Massive (Astrophysical) Compact Halo Object