| 2025-10-20 | What covers the North Pole |
| 2024-05-05 | Large white sheet |
| 2022-03-05 | Contracting sheet |
| 2019-02-21 | Geographical feature of Mars |
| 2018-07-06 | One of two polar opposites |
| 2017-07-30 | Top of the world |
| 2017-05-05 | Pole topper |
| 2017-04-15 | Feature of Earth, Mars and Pluto |
| 2016-11-05 | Martian feature |
| 2011-08-04 | Cold cover? |
| 2010-10-28 | Top-of-the-world topper |
| 2010-01-31 | Global warming panel concern |
| 2010-01-24 | Polar feature |
| 2008-11-13 | Martian feature |
| 2004-10-07 | One in the pole position? |
| 2002-11-16 | Greenland sight |
| 1999-11-24 | Most of the Arctic Ocean |
| 1999-04-14 | Polar buildup |
| 1998-02-22 | Martian feature |
| 1997-04-01 | Polar feature |
| 1997-03-23 | Cold pack? |
| 1995-06-20 | Polar cover |
| 1995-01-02 | Polar covering |
| 1995-01-01 | Glossy cover |
| 1994-07-04 | Hangover soother? |