One theory was that dark matter might consist of Massive Astrophysical Compact Halo Objects (MACHOs)—faint but massive objects such as red dwarfs and planets in the outer regions of galaxies.
En teori var, at mørkt stof kunne bestå af MACHOer (Massive Astrophysical Compact Halo Objects), som er svagtlysende, men massive objekter som røde dværge og planeter i galaksernes ydre regioner.