| 100% | OGO | 3 | Six-satellite NASA program that studied the Earth's magnetosphere in the '60s and '70s (abbr.) |
| 38% | DUTCHELM | 8 | Disease of trees, most obvious in the 60s and 70s |
| 37% | BILLIEJEANKING | 14 | Six-time Wimbledon singles champ in the '60s and '70s |
| 36% | AQUA | 4 | NASA satellite launched in Earth orbit on May 4, 2002 to study and measure radiance, reflectance and backscatter |
| 35% | ISS | 3 | Low Earth artificial satellite that includes the Kibo and Rassvet modules (abbr.) |
| 35% | USSR | 4 | Country that underwent perestroika in the eighties and nineties: Abbr. |
| 34% | AURA | 4 | US satellite launched in 2004 to study Earth's ozone layer, air quality and climate |
| 34% | AURORAE | 7 | Displays that result from interactions in the magnetosphere and the ionosphere |
| 34% | XKE | 3 | Jaguar sports car model that came out in the 60s: Abbr. |
| 33% | SONNY | 5 | Cher's musical partner of the 60s and 70s |
| 33% | VHS | 3 | VCR format that was a popular mode of watching 19a in the 1980s and 1990s: Abbr. |
| 33% | MLB | 3 | Organization that the Yankees and Red Sox play in: Abbr. |
| 32% | MBA | 3 | Degree that started materialising in the early 20's, and is one of the most sought after courses nowadays : Abbr. |
| 32% | SPACE | 5 | The "S" in NASA, and a word that can be used alongside 22a, 39a, 40a, 50a, 27d, and 29d |
| 32% | GEOGRAPHY | 9 | The study of Earth's features and places |
| 32% | GEOLOGY | 7 | Branch of science that deals with the study of earth as well as its structure and composition |
| 32% | CCC | 3 | New Deal program that created work opportunities in national and state parks: Abbr. |
| 32% | USSR | 4 | Nation that split into Russia and 14 other nations in the 1990s: Abbr. |
| 31% | SNL | 3 | NBC's sketch comedy show that was hosted by the athletes mentioned in 20a, 31a, 1d, 29d, and 42d: Abbr. |
| 31% | PIONEER | 7 | NASA program that explored the outer planets |
| 31% | SSRS | 4 | Latvia and Lithuania, in the '60s: Abbr. |
| 31% | HBO | 3 | Cable channel that airs the show in 18a, and other shows like "Game of Thrones": Abbr. |
| 31% | RUGBY | 5 | Team contact sport that originated in England and features in the Six Nations Championship |
| 31% | STYX | 4 | River that separates Earth and the Underworld, in Greek myth |
| 31% | ATL | 3 | City that's home to the Hawks and Falcons: Abbr. |
| 31% | PLO | 3 | Arab group that's headquartered in the West Bank: Abbr. |
| 31% | NOR | 3 | Country that's partially in the Arctic: Abbr. |
| 31% | UCLA | 4 | West Coast school that's the most applied to in the US: Abbr. |
| 31% | IBM | 3 | Developer of NASA's computers in the 1960s: Abbr. |
| 31% | NATO | 4 | An alliance between American and European forces, that played a big part in the occupation of Afghanistan: Abbr |