Apparently, a great deal of dark, unseen material exists, whose gravitational pull is responsible for the motions of the stars and galaxies that we see.

What cannot be known is more revealing than what can.

We can predict the present without having to know everything about the past.

There is no reason that the universe should be designed for our convenience.

Apparently, a great deal of dark, unseen material exists, whose gravitational pull is responsible for the motions of the stars and galaxies that we see.

We are just strings of quarks living in a suburb of the local density maximum of the universe.

There are only certain intervals of time when life of any sort is possible in an expanding universe and we can practise astronomy only during that habitable time interval in cosmic history.