| SPUTNIK | Any of a series of Soviet satellites, such as - I, launched in 1957 (7) |
| LANDSAT | The byname of Earth Resources Technology Satellite (ERTS), any of a series of uncrewed U.S. scientific satellites, the first of which were launched in 1972, 1975, and 1978 to collect information about |
| MARINER | Any of a series of US space probes launched between 1962 and 1971 that sent back photographs of Mars and Venus (7) |
| CRUSADE | Any of a series of Christian expeditionary wars undertaken during the 11th-13th Centuries (7) |
| SALYUT | The name for any of a series of Soviet space stations (of two designs), launched between 1971 and 1982, that served as living quarters and scientific laboratories or military reconnaissance platforms. |
| NUTSHELL | Covering of an acorn or culinary seed such as a pistachio; novel by Ian McEwan; or, any of a series of short books summarising areas of law (8) |
| TRABANT | East German car launched in 1957 that was built at Zwickau (7) |
| LUNA | ___ moth, a large, pale green saturniid of North America, or any of a series of Soviet probes to the Moon from 1959 to 1976 (4) |
| EXPLORER | Any of the first series of U.S. satellites, such as --- 1, launched in 1958 (8) |
| APOLLO | Any of a series of manned US spacecraft such as ___ 11, that landed on the moon in 1969 (6) |
| DRIP | Any of a series of "plops" of water falling from a leaky tap, for example (4) |
| PRONOUN | Word such as I or she |
| TASSE | Any of a series of jointed metal plates forming a skirtlike protection of armor for the lower trunk and thighs |
| CANEL | Any of a series of channel-like markings visible on the surface of Mars when viewing through a telescope (5) |
| TIANGONG | Name for any of a series of three Chinese space stations, the first of which was launched on September 29, 2011. (8) |
| CHERRY | Any of a series of berrylike fruits with stones used in the traditional counting game tinker, tailor (6) |
| SIBERIA | Where dissidents were sent by heads of Soviet intelligence -- one in particular (7) |
| VENERA | The name for any of a series of uncrewed Soviet planetary probes that were sent to Venus between 1961 and 1983, with some landing on the planet's surface. (6) |
| NOTE | Any of a series of musical symbols whose solmisation derives from the Latin hymn Ut queant laxis (4) |
| SOYUZ | Any of a series of Russian spacecraft used to ferry crew to and from space stations (5) |
