And so we can use the spin rate, the rotation rate of a star, as a clock to measure its age.
因此，我们可以用星星的自转速度及速率作为衡量它们年龄的计时器。
2
Star Wars themed alarm clock will project the time on your wall.
这款星球大战主题闹钟会把时间投影到你的墙上。
3
These signals, which show up because the telescope can't watch the star continuously, look like they could actually be planets, but they would disappear if we could observe round the clock.