Polyarnye siyaniya nad Alyaskoi
4.03.1998 | Astronomicheskaya kartinka dnya

Vyshe, chem samye vysokie gory , vyshe, chem proletayut samolety, poyavlyayutsya polyarnye siyaniya . Polyarnye siyaniya ne byvayut nizhe 60 km nad Zemlei i mogut prostirat'sya do 1000 km. Polyarnye siyaniya poyavlyayutsya, kogda elektrony i protony solnechnogo vetra vrezayutsya v molekuly atmosfery Zemli i vozbuzhdayut ih.