They likely formed before the diskof our Milky Way, so they are older than nearly all other stars in our galaxy.
他们很可能在我们的银河系大圆盘出现之前就已经形成，所以他们几乎比我们银河系的所有恒星都要古老。
2
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。
3
The bizarre configuration could have been caused by the chance capture of material from a passing galaxy by the disk galaxy, with the captured debris strung out in a rotating ring.