If ISON survives this Thanksgiving Day encounter, it could make for some truly spectacular sky-watching.

如果爱森彗星能从这次感恩节碰撞中生还，它能创造出真正惊人的天空奇观。

Comet ISON has flared so bright in recent days that it's now visible with the naked eye.

最近爱森彗星的光非常耀眼，人们凭肉眼就能看到。

ISON started its journey thousands of years ago in the Oort Cloud, a spherical collection of icy bodies about one light-year from the sun.

几千年前，爱森彗星从奥尔特云——距离太阳约1光年的一个球形冰体集合——出发开始了它的旅程。