Historical clue formulations

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