It's done by NASA. We've all seen Google Earth; this is an open-source version of that. There are plug-ins to be able to load in different data sets that NASA's collected over the years.
是NASA研发的。它就像我们都见过的谷歌地球 这就好像是 它的开源码版本。有附加档能够加载 NASA多年搜集的各种资料