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The Planck satellite may detect the imprint of the gravitational waves predicted by inflation. This would be quantum gravity written across the sky.

We can see every square metre of the planet on Google Earth. But there is no substitute for that sensory experience of going out into the world and discovering things for yourself.

Gravitational and electromagnetic interactions are long-range interactions, meaning they act on objects no matter how far they are separated from each other.

Planets are too dim to be detected with existing equipment, far away, except in these very special circumstances where they're seen by their gravitational effect.

The blackness of space was a big shock to me. It is a deep, three-dimensional, oily blackness. You can feel the distance.

The cyclic universe theory predicts no gravitational waves from the early universe.

Gravitational waves will bring us exquisitely accurate maps of black holes - maps of their space-time. Those maps will make it crystal clear whether or not what we're dealing with are black holes as described by general relativity.

We know there is gravity because apples fall from trees. We can observe gravity in daily life. If we could throw an apple to the edge of the universe, we would observe it accelerating.

Any astrophysicist does not feel small looking up at the universe; we feel large.

I've been noticing gravity since I was very young.