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A fact from Hesperian appeared on Wikipedia's Main Page in the Did you know column on 16 July 2011 ( check views). The text of the entry was as follows: Did you know... that during the Hesperian, Mars changed from a wet, warm world to today's dry, cold, and dusty planet? A record of the entry may be seen at Wikipedia:Recent additions/2011/July.

"characterized by widespread volcanic activity and catastrophic flooding" - can something be a catastrophe if there is no-one around to be adversely affected by it? (AFAWK.) I thought that 'catastrophe' specifically meant 'bad' rather than just 'had a significant effect', but perhaps geologists use it differently. -- 86.150.60.188 ( talk) 07:57, 16 July 2011 (UTC) reply

In geology the word usually means sudden and rapid as opposed to slow and gradual (i.e., happening in a geologic instant rather than over very long periods of time). I think the use goes back to the early days of the science when the primary debate was catastrophism vs. gradualism. Schaffman ( talk) 10:22, 8 August 2011 (UTC) reply

The timeline graphics is drawn here and in the other two articles Noachian and Amazonian - How should we make it a shareable resource ? - Rod57 ( talk) 10:33, 20 February 2019 (UTC) reply