Quotes About Astrophysics

General relativity predicts that time ends inside black holes because the gravitational collapse squeezes matter to infinite density.

The field equations and the whole history of general relativity have been complicated.

I've seen children's eyes light up when I tell them about black holes and the Big Bang.

Black holes can bang against space-time as mallets on a drum and have a very characteristic song.

We knew about black holes in other ways, and we knew about neutron stars - well, those are the two things that ultimately got seen.

Einstein got most of the things right about black holes. I'm not an expert, I must admit.

Baryons don't expand when the universe expands.

Christopher Savage have calculated that in reasonable models, we expect about ten dark-matter particles to interact with the atoms in a typical human body every year. The effects of every individual interaction are pretty negligible, so don't worry about getting a dark matter stomachache.

Then we compare the predicted abundance of such a WIMP with the actual abundance of dark matter.

I'm helping launch the new Milky Way Chocolate Ice Cream Bar. I play an astrophysicist on television, and the name of the bar is Milky Way, so put two and two together, and here I am.

the total number of galaxies in the universe seems to be in the region of ten billion, and that each of them has about a hundred billion stars the size of the sun.

Whenever I saw the sun, I reminded myself that I was looking at a star. One of over a hundred billion stars in our galaxy. A galaxy that was just one of billions of other galaxies in the observable universe. This helped me keep things in perspective.

Whenever I saw the sun, I reminded myself that I was looking at a star . One of over a hundred billion in our galaxy. A galaxy that was just one of billions of other galaxies in the observable universe. This helped me keep things in perspective.

The single difference between the theory I propose and the ideas current in modern astrophysics is that I assume that an infinite conscious intelligence preexists. You cannot get away from the preexistence of something, and whether that is an ensemble of physical laws generating infinite random universes or an infinite conscious intelligence is something present-day science cannot resolve, and indeed one view is not more rational than the other. One

If the rate of expansion one second after the Big Bang had been smaller by even one part in a hundred thousand million million, it would have recollapsed before it reached its present size. On the other hand, if it had been greater by a part in a million, the universe would have expanded too rapidly for stars and planets to form.

We account for one-sixth of the forces of gravity we see in the universe. There is no known objects accounting for most of the effective gravity in the universe. Something is making stuff move that is not anything we have ever touched.

Only black holes of very low mass would emit a significant amount of radiation.

How many of your friends know that there's a "sun inside the Sun"? Or that a bizarre, newly found zone beneath the solar surface, the tachocline, is solely responsible for its violence? Or that we just experienced the oddest solar cycle in more than two hundred years—which has apparently influenced global warming in a major way?

The Universe in a Nutshell

We are made out of stardust. The iron in the hemoglobin molecules in the blood in your right hand came from a star that blew up 8 billion years ago. The iron in your left hand came from another star.

The sun derives its energy from fusion reactions in which hydrogen is transformed into helium.

In three minutes, 98 percent of all the matter there is or will ever be has been produced. We have a universe

The core of a neutron star is so dense that a single spoonful of matter from it would weigh more than 500 billion kilograms.

that if you looked deep enough into space you should find some cosmic background radiation left over from the Big Bang.