Wow, that's a really awesome factoid. This QA goes more into this observation: https://space.stackexchange.com/questions/14383/how-much-bigger-could-earth-be-b

Wow, that's a really awesome factoid. This QA goes more into this observation: https://space.stackexchange.com/questions/14383/how-much-bigger-could-earth-be-before-rockets-wouldt-work https://space.stackexchange.com/questions/14383/how-much-big... From what's there it looks like it's a lot higher than 40% as a limit.