The only limit to our realization of tomorrow will be our doubts of today.
Before I came here I was confused about this subject. Having listened to your lecture I am still confused. But on a higher level.
It will take about a thousand million million million million years for the Earth to run into the sun, so there’s no immediate cause for worry!
我们每一次的观察都是向理解宇宙迈近的一步。