Topic: In search of Vulcan

[knightstorm]

An interesting article on how the existence of a theoretical first planet in the solar system was disproved.

https://www.nationalgeographic.com/news/2015/11/151104-newton-einstein-gravity-vulcan-planets-mercury-astronomy-theory-of-relativity-ngbooktalk/?cmpid=org=ngp::mc=social::src=twitter::cmp=editorial::add=tw20191123science-vulcanspacesaturday::rid=