Quotes by Andrea M. Ghez - Page 1

Gravity wins over all other known forces.
Andrea M. Ghez / Astronomer
Force
Gravity
Winning
Forces
Over
Wins
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Any time things go to infinity in physics, we know we haven't gotten it right.
Andrea M. Ghez / Astronomer
Havens
Infinity
Physics
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An ordinary black hole is thought to be the end state of a really massive star's life.
Andrea M. Ghez / Astronomer
Black
Black Hole
Massive
Ordinary
Star
Hole
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The atmosphere is great for people - it allows us to survive - but it's a real headache for astronomers.
Andrea M. Ghez / Astronomer
Atmosphere
Headache
Great People Real
Survive
To Survive
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The Keck telescope, which is the largest in the world, had opened just before I began my faculty position at UCLA.
Andrea M. Ghez / Astronomer
Faculty
Telescopes
Ucla
World
Largest
Opened
Telescope
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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.
Andrea M. Ghez / Astronomer
Black Hole
Orbit
Fortunately
Hole
Sucked
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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.
Andrea M. Ghez / Astronomer
Black Hole
Mass
Stars
Volume
Tremendous
Hole
Motions
Proving
Showing
Tremendous Amount
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Our galaxy's pretty ordinary, garden-variety. So if we believe our galaxy has a super massive black hole, that tells us that most, if not all, galaxies host such a black hole at their centers.
Andrea M. Ghez / Astronomer
Black Hole
Host
Massive
Ordinary
Centers
Galaxies
Hole
Super
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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.
Andrea M. Ghez / Astronomer
Black Hole
Mass
Proof
Size
Solar System
Sun
Volume
Tremendous
Comparable
Hole
Million Times
Region
Solar
Tremendous Amount
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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.
Andrea M. Ghez / Astronomer
Black
Differences
Holes
Lit
Massive
Surroundings
Basically
Black Holes
Galaxies
Material
Super
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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?'
Andrea M. Ghez / Astronomer
Black Hole
Galaxy
Surroundings
Center
Emission
Falling
Hole
Mysteries
Onto
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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.
Andrea M. Ghez / Astronomer
Black Hole
Galaxy
Measuring
Center
Cluster
Hole
Motion
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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.
Andrea M. Ghez / Astronomer
Science
Black
Black Hole
Massive
Milky Way
Simple
Started
Love Science Always
Center
Off
Hole
One Of The Things
Question
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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.
Andrea M. Ghez / Astronomer
Closest
General Relativity
Orbit
Precise
Relativity
Theory
Einstein
Measurements
Short Period
Test
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As an astronomer, I get to ignore the details of the things that we dont understand. Theres a lot of work that we can do on scales that we do understand, and there is actually a finite size that I can associate with a super massive black hole.
Andrea M. Ghez / Astronomer
Black
Details
Size
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As an astronomer, I get to ignore the details of the things that we don't understand. There's a lot of work that we can do on scales that we do understand, and there is actually a finite size that I can associate with a super massive black hole.
Andrea M. Ghez / Astronomer
Black Hole
Details
Finite
Massive
Scales
Size
Associate
Astronomer
Hole
Ignore
Super
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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.
Andrea M. Ghez / Astronomer
Zero
Amount
Black
Black Hole
Clue
Exotic
Holes
Huge
Mass
Objects
Understanding
Volume
Inside
Quite
Center
Technically
Hole
Huge Amount
Physicists
Puts
Sense
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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!
Andrea M. Ghez / Astronomer
Zero
Black Hole
Confined
Density
Describing
Holes
Mass
Volume
Hole
Infinitely
Region
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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.
Andrea M. Ghez / Astronomer
Black Hole
Exotic
Galaxy
Massive
Objects
Prove
Center
Hole
Super
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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.
Andrea M. Ghez / Astronomer
Black Hole
Galaxy
Mass
Orbit
Planets
Sun
Volume
Center
Tremendous
Hole
Motions
Proving
Showing
Tremendous Amount
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How do you observe something you can't see? This is the basic question of somebody who's interested in finding and studying black holes. Because black holes are objects whose pull of gravity is so intense that nothing can escape it, not even light, so you can't see it directly.
Andrea M. Ghez / Astronomer
Gravity
Holes
Intense
Black Holes
Directly
Escape
Observe
Pull
Studying
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Astronomers are obsessed with building larger and larger telescopes. There are two promises that we make with bigger telescopes: that they can see fainter things and that they see more detail. But it's been really hard to follow through on that second promise because of atmospheric distortion.
Andrea M. Ghez / Astronomer
Bigger
Distortion
Follow Through
Promise
Atmospheric
Detail
Follow
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