OORT
| Date | Clue |
|---|---|
| 2024-12-08 | Dutch astronomer with an eponymous ice cloud |
| 2023-07-01 | Dutch scientist with an eponymous "cloud" |
| 2023-04-13 | Dutch astronomer with an eponymous "cloud" |
| 2016-05-18 | ___ cloud (source of comets) |
| 2014-08-31 | ___ cloud (source of comets) |
| 2012-02-18 | Kind of cloud |
| 2010-12-15 | Astronomy's ___ cloud |
| 2010-01-17 | ___ cloud (solar system outlier) |
| 2009-08-20 | ___ cloud (region of comets far beyond Pluto) |
| 2008-02-13 | Astronomy's ___ cloud |
| 2006-06-08 | ___ cloud (astronomical sighting) |
| 2004-02-03 | ___ cloud (cosmic debris) |