They are believed to exist because of unexplained gravitational forces that they appear to exert on other astronomical objects. (sciencenewsforstudents.org)
TESS will observe 85 percent of the sky over its two - year prime mission and is expected to discover thousands of new worlds, as well as other astronomical objects like galaxies. (scientificamerican.com)
Most of the letters of the alphabet already have strong associations with other astronomical objects, so «after eliminating these «used» letters from consideration, there are really only a few left, and those are H, Y, and Z,» Cushing added. (scientificamerican.com)