Wiktionary
massive compact halo objects
n. (massive compact halo object English)
Usage examples of "massive compact halo objects".
At least the names for the two main possible culprits are entertaining: they are said to be either WIMPs (for Weakly Interacting Massive Particles, which is to say specks of invisible matter left over from the Big Bang) or MACHOs (for MAssive Compact Halo Objects—.