C14 Edge + ASI 290 + IR 685
If the Moon were rotated 65 Â° to the south, Pythagoras would replace Copernicus as the most impressive visible crater. Pythagoras is a larger version of Copernicus – 130 km in diameter and about 5 km deep, compared with 93 km and 3.8 km. Surprisingly, the highest central peaks are higher than some of the surrounding terrain, in violation of the MÃ¤dler Rule. This rule has never been confirmed with modern data, but it seems right. Unlike Copernicus, Pythagoras does not seem to retain its rays when seen on the full moon. Its greater age was recognized during the Apollo era when it was mapped as being of the same age as the ancient lavas of Imbrium. One thing the ancient astronomers did not know is that the central peaks of Pythagoras, such as those of Anaxagoras, Philolaus, and Carpenter, contain pure anorthosite, remnants of ocean magma. Like Moretus near the south pole, Pythagoras offers an oblique view of what large, complex, fresh craters really look like.
If we had been observing a billion years ago, when the two polar craters were cool with light rays, Copernicus could still be hot with molten lava on the ground. Tycho in that case, would still be 900 million years in the future.
Source: LPOD – Chuck Wood (several)
Adaptation: Avani Soares