Synonyms to pair of twins

Gemini, ATDA, ATS, Alouette, Anna, Apollo, Ariel, Atlas-Score, Biosatellite, Castor and Pollux, Comsat, Cosmos, Courier, Diapason, Discoverer, ERS, Early Bird, Echo, Elektron, Explorer, GATV, Injun, Intelsat, Lofti, Luna, Lunar Orbiter, Lunik, Mariner, Mars probes, Mercury, Midas, Nimbus, OAO, OGO, OSO, Pageos, Pegasus, Pioneer, Proton, Ranger, Relay, Samos, San Marco, Secor, Siamese twins, Sputnik, Surveyor, Syncom, Telstar, Transit, Tweedledum and Tweedledee, Twin Stars, Vanguard, Viking, Voskhod, WRESAT, Zond, artificial satellites, exact mates, fraternal twins, identical twins, spacecraft, twins, dead heat, deadlock, draw, even break, fair shake, knotted score, neck-and-neck race, photo finish, stalemate, standoff, the same, tie