Oberon (moon) geological feature on Oberon: craters and chasmata ('canyons'—deep, elongated, steep-sided depressions which would probably be described as rift valleys or escarpments if on Earth). Oberon's surface is the most heavily cratered of all the Uranian moons, with a crater density approaching saturation—when the formation of new craters is balanced by destruction of old ones. This high number of craters indicates that Oberon has the most ancient surface among Uranus's moons. The crater diameters range up to 206 kilometers for the largest known crater, Hamlet. Many large craters are surrounded by bright impact ejecta (rays) consisting of relatively fresh ice. The
Oberon (operating system) active Computer Science professors) referred to themselves as 'part-time programmers' in the book 'Project Oberon'. In late 2013, a couple of months before his 80th birthday, Niklaus Wirth published a second edition of Project Oberon. It details the implementation of the Oberon System using a RISC CPU of his own design realized on a Xilinx FPGA board. It was presented at the symposium organized for his 80th birthday at ETHZ. In the meantime several emulators for this version were implemented. According to Josef Templ, a former member of the developer group at Eidgenössische Technische Hochschule, Zürich and later member of