A rare galaxy type, polar ring galaxies have a substantial population of stars, gas, and dust orbiting in rings nearly perpendicular to the plane of the galactic disk.
极环星系是种稀有的星系类型，它们有着几乎和银盘平面垂直，呈环形公转的大量的恒星、气体和星尘。
As I climb through the stars, stretching myself into a constellation, the Great Polar Bear, I wonder how many millions of years it will be before a wiser species than Homo sapiens inhabits the earth?
当我穿过那些星星，伸展成为一个星座——大北极熊星座，我好奇地想，要过多少个百万年，才能有一个比智人更智慧的物种栖息于地球？
The idea is that if polar alignment is off, the stars in the photo will show a line.
作用是对极轴不准时，星会在照片中呈现一条线（拉线）；
The idea is that if polar alignment is off, the stars in the photo will show a line.
作用是对极轴不准时，星会在照片中呈现一条线（拉线）；
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