https://www.scientificamerican.com/article/hurricane-harvey-closes-nasa-center-in-houston/ >NASA's Johnson Space Center (JSC) in Houston is closed today (Aug. 27) to all but mission-critical staff, due to heavy rainfall caused by Hurricane Harvey. Mission Control, which oversees the operation of the International Space Station, "remains operational and fully capable of supporting [the station]," according to NASA's website. >The main entrance to JSC, and many of the roads leading to JSC's other entrances, were flooded as of this morning, according to the JSC Emergency Management website. (Since that update was posted this morning, rainfall has begun again in the area around JSC, which could mean flooding). On some of the flooded streets, cars have been abandoned on the roads, officials said. [Hurricane Harvey: Photos of the Massive Storm from Space]