銀河系中心附近的恒星就像宇宙時(shí)鐘，幫助我們繪制時(shí)空?qǐng)D。
挑戰(zhàn)在于使不可見(jiàn)的東西變得可見(jiàn)。
The main task in life is simply this: to identify and separate matters so that I can say clearly to myself which are externals not under my control, and which have to do with the choices I actually control.