Words matter. These are the best Andrea M. Ghez Quotes, and they’re great for sharing with your friends.
Proof of the black hole is a tremendous amount of mass inside a very small volume. There’s 4 million times the mass of our sun within a region that’s comparable to the size of our solar system.
I’m interested in finding whether or not there is a really massive, what we like to call ‘super massive’ black hole at the center of our galaxy. And the reason this is interesting is that it gives us an opportunity to prove whether or not these exotic objects really exist.
The star S0-2 orbits around Sgr A* every 16 years and will go through its closest approach in 2018. That’s an opportunity to test Einstein’s General Relativity theory through very precise measurements of this star’s short period orbit.
One of the key differences between galaxies with super massive black holes is whether or not the black holes are lit up, because they are basically bingeing on a lot of material in its surroundings.
We have this interesting problem with black holes. What is a black hole? It is a region of space where you have mass that’s confined to zero volume, which means that the density is infinitely large, which means we have no way of describing, really, what a black hole is!
The key to proving that there’s a black hole is showing that there’s a tremendous amount of mass in a very small volume. And you can do that with the motions of stars. The way the star moves around the center of the galaxy is very much like the way the planets orbit the sun.
There’s a large cluster of stars that are orbiting the center of our galaxy. And by measuring the motion of stars, and in particular, their orbits, we can figure out whether or not there’s a central black hole.
Black holes are very exotic objects. Technically, a black hole puts a huge amount of mass inside of zero volume. So our understanding of the center of black holes doesn’t make sense, which is a big clue to physicists that we don’t have our physics quite right.
The atmosphere is great for people – it allows us to survive – but it’s a real headache for astronomers.
Fortunately, most things around the supermassive black hole are just going to go around it. They’re going to orbit it. They don’t actually get sucked in.
The Keck telescope, which is the largest in the world, had opened just before I began my faculty position at UCLA.
One of the big mysteries about the black hole at the center of the galaxy is, ‘Why don’t we see emission from matter falling onto the black hole, or, rather, the black hole eating up its surroundings?’
The question that I started off with was, I thought, very simple. It was just ‘Is there a massive black hole at the center of the Milky Way?’ But one of the things I love about science is that you always end up with new questions.
Gravity wins over all other known forces.
An ordinary black hole is thought to be the end state of a really massive star’s life.
