While Hiding Behind the Sun, Jupiter Loses One of its Belts
Jupiter, Before and After Anthony Wesley The science world is upside down this afternoon. First North Korea announces it has cracked the nut on nuclear fusion. Now Jupiter has lost one of its belts, specifically the Southern Equatorial Belt (SEB) which figures prominently in Jupiter's overall appearance. Astronomers aren't exactly sure why this happens, but the flightiness of the SEB is actually not unprecedented. Jupiter's bands are actually clouds, with the SEB being primarily made up of ammonia ice, sulfur, and phosphorous hovering above the planet's toxic, gaseous surface. The belt took leaves of absence in both the early 1990s and in 1973, so its disappearance now, if anything, is a bit overdue (it seems to be on a roughly 15-year cycle). But due to the orbital dynamics of Earth and Jupiter, this particular disrobing was far more abrupt. Jupiter has been hanging out on the other side of the sun...