Umbriel (moon) that obliterated its older surface. Covered by numerous impact craters reaching in diameter, Umbriel is the second most heavily cratered satellite of Uranus after Oberon. The most prominent surface feature is a ring of bright material on the floor of Wunda crater. This moon, like all moons of Uranus, probably formed from an accretion disk that surrounded the planet just after its formation. The Uranian system has been studied up close only once, by the spacecraft "Voyager 2" in January 1986. It took several images of Umbriel, which allowed mapping of about 40% of the moon’s surface. Umbriel, along with
Oberon (operating system) 2002.<br> BB, BlackBox Component Builder. Component Pascal IDE from Oberon Microsystems.<br> Bluebottle OS, And again another name for the Active Object System, 2003.<br> BRAM, Block Addressable Random Access Memory, as used in the FPGA machine.<br> CP, Component Pascal. A dialect in the Oberon family most similar to Oberon-2.<br> ETHO, Oberon as developed at Eidgenössische Technische Hochschule (ETH) Zürich.<br> Fox, The compiler for Active Oberon, appearing in AOS (= A2 = Bluebottle).<br> LEO, Linux ETH Oberon. ETHO 2.4.3 for Linux x86.<br> LNO, Linux Native Oberon.<br> NO, Native Oberon. Oberon running on bare hardware rather than atop another operating system.<br> OLR, Oberon