This presents considerable difficulties as the Earth's atmosphere is almost entirely opaque from 20μm to 850μm, with narrow windows at 200μm and 450μm.
Tai sukelia nemažus sunkumus, kadangi Žemės atmosfera yra neskaidri nuo 20 μm iki 850 μm, su labai siaurais pralaidumo langais ties 200 ir 450 μm.