| 2025-12-29 | The "S" of NASA |
| 2024-10-22 | "The final frontier" |
| 2024-08-11 | "___ is to place as eternity is to time": Joseph Joubert |
| 2023-05-15 | Astronaut's realm |
| 2022-06-05 | ____ bar |
| 2021-07-25 | Company that makes recoverable and reusable rocket boosters |
| 2020-08-26 | "The final frontier" |
| 2020-06-12 | Remote station location |
| 2019-08-22 | Elbow room |
| 2019-06-09 | #, to a proofreader |
| 2019-03-26 | Breathing room |
| 2018-10-22 | The final frontier, per "Star Trek" |
| 2018-02-27 | The "S" of NASA |
| 2017-11-16 | What " " contains |
| 2017-05-04 | It's out of this world |
| 2016-06-05 | Result of hitting the bar? |
| 2016-01-21 | It's below "C V B N M" |
| 2015-10-23 | "The breath of art," per Frank Lloyd Wright |
| 2015-10-17 | See 25-Across |
| 2015-06-18 | The heavens |
| 2014-09-10 | "I need my ___" |
| 2013-09-24 | See 13-Across |
| 2012-01-08 | Go into la-la land, with "out" |
| 2011-08-25 | Zone (out) |
| 2011-02-25 | Opportunity for privacy |
| 2011-02-20 | It's just below a B |
| 2010-09-28 | Gap |
| 2007-12-10 | Rocket's realm |
| 2007-08-02 | Vacuum |
| 2006-01-16 | "The final frontier" |
| 2005-02-07 | "The final frontier" |
| 2003-07-29 | Breathing room |
| 2003-01-16 | See 1-Across |
| 2002-12-02 | "The final frontier" |
| 2002-09-21 | Reserved seat |
| 2002-05-21 | #, to a proofreader |
| 2000-06-18 | Gap |
| 2000-06-13 | "The final frontier" |
| 2000-01-05 | #, to a typesetter |
| 1999-10-25 | Extraterrestrial realm |
| 1999-07-28 | "The final frontier" |
| 1999-06-27 | Parker's need |
| 1999-05-05 | Elbowroom |
| 1999-02-03 | "Star Trek" setting |
| 1998-12-02 | Elbowroom |
| 1998-10-24 | Margin |
| 1998-05-17 | 1982 Michener epic |
| 1998-02-14 | Berth |
| 1997-08-29 | 1982 Michener epic |
| 1997-07-29 | Part of NASA |
| 1997-03-25 | "The final frontier" |
| 1997-01-12 | Slot |
| 1996-09-11 | Freedom within a relationship |
| 1995-06-22 | Elbowroom |
| 1995-06-13 | "_____, the final frontier..." |
| 1995-05-31 | Word with parking or breathing |
| 1995-01-25 | Parking _____ |
| 1994-12-15 | Room |
| 1994-11-20 | Leeway |
| 1994-05-01 | "#," to a proofreader |
| 1994-03-04 | Kind of bar |