PROBE
| Date | Clue |
|---|---|
| 2024-12-01 | Government investigation |
| 2023-09-13 | NASA project |
| 2023-07-14 | Get personal, say |
| 2022-03-17 | Voyager 1, for one |
| 2020-11-28 | Really dig |
| 2019-08-11 | Investigation |
| 2019-02-27 | Do some digging |
| 2017-09-17 | Dig for answers |
| 2016-04-08 | Nonhuman explorer |
| 2015-04-19 | Investigation |
| 2014-06-04 | See circled letters |
| 2014-02-09 | Certain NASA launch |
| 2013-05-19 | Certain NASA launch |
| 2012-08-20 | Government investigation |
| 2012-05-01 | Look into |
| 2011-03-21 | Exploratory spacecraft |
| 2004-06-09 | Exploratory spacecraft |
| 2003-07-22 | Space explorer |
| 1998-12-21 | Grand jury's activity |
| 1998-09-06 | Investigation |
| 1998-04-14 | Deep-space mission |
| 1997-05-06 | Explore |
| 1996-02-01 | Investigation |
| 1994-06-25 | Perscrutation |