The pinpoints of starlight we see with the naked eye are photons that have been streaming toward us for a few years or a few thousand.

Evidence in support of general relativity came quickly. Astronomers had long known that Mercury’s orbital motion around the sun deviated slightly from what Newton’s mathematics predicted. In 1915, Einstein used his new equations to recalculate Mercury’s trajectory and was able to explain the discrepancy, a realization he later described to his colleague Adrian Fokker as so thrilling that for some hours it gave him heart palpitations.

We might be the holographic image of a two-dimensional structure.

Gravity is matter’s sugar daddy.

In quantum mechanics there is A causing B. The equations do not stand outside that usual paradigm of physics. The real issue is that the kinds of things you predict in quantum mechanics are different from the kinds of things you predict using general relativity. Quantum mechanics, that big, new, spectacular remarkable idea is that you only predict probabilities, the likelihood of one outcome or another. That's the new idea.

Physicists have come to realize that mathematics, when used with sufficient care, is a proven pathway to truth.

For me it's been very exciting to contribute to the public's understanding of how rich and wondrous science is.