EARTHS
| Date | Clue |
|---|---|
| 2018-03-25 | Planets like ours, in sci-fi |
| 2013-03-14 | Cerium and samarium are rare ones |
| 2008-02-10 | "At the ___ Core," 1976 sci-fi film |
| 2005-01-16 | Brownish pigments |
| 2002-04-26 | "___ crammed with heaven": E. B. Browning |
| 1994-09-17 | Agronomists' studies |
| 1993-12-18 | Kipling's "When _____ Last Picture Is Painted" |