M87 was a galaxy. Also called Hoag's Galaxy with Sagan 2 planet also called New Earth.
History
Circa 4,999,999,740 AD one of its constituent planets, New Savannah, joined the New Earth Empire, which was presumably set up before the aforementioned date. (COMIC: Agent Provocateur)
By 5,000,000,023 AD, humanity was fully established (with a population of at least ten million) on the planet New Earth after the original had been destroyed 23 years earlier. The planet had a similar orbit, atmosphere, and size to the original Earth. (TV: New Earth)
A population of devolved Macra were discovered living deep beneath New New York by Martha Jones and the Tenth Doctor while they were on New Earth. (TV: Gridlock)
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