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Black Holes: Feeling the Ripples

A Chandra image of the supermassive blackhole at the center of our Galaxy.
A Chandra image of the supermassive blackhole at the center of our Galaxy.

Credit NASA/CXC/MIT.F. K. Baganoff et al.
Astronomers have finally confirmed something they had long suspected: there is a super-massive black hole in the center of our Milky Way galaxy. The evidence? A star near the galactic center orbits something unseen at a top speed of 5000 kilometers per second. Only a black hole 3 million times more massive than our Sun could cause the star to move so fast.

Still, a key mystery remains. Where did the black hole come from? For that matter, where do any super-massive black holes come from? There is mounting evidence that such "monsters" lurk in the middles of most galaxies, yet their origin is unknown. Do they start out as tiny black holes that grow slowly, attracting material piecemeal from passing stars and clouds? Or are they born big, their mass increasing in large gulps when their host galaxy collides with another galaxy?

An artist's impression of a supermassive black hole at the center of a galaxy.

An artists impression of a supermassive black hole at the center of a galaxy.


A new space observatory called LISA (short for "Laser Interferometer Space Antenna") aims to find out. Designed by scientists at NASA and the European Space Agency, LISA doesn't detect ordinary forms of electromagnetic radiation such as light or radio waves. It senses ripples in the fabric of space-time itself--gravitational waves.

Albert Einstein first realized in 1916 that gravitational waves might exist. His equations of general relativity, which describe gravity, had solutions that reminded him of ripples on a pond. These "gravity ripples" travel at the speed of light and, ironically, do not interact much with matter. As a result, they can cross the cosmos quickly and intact.

Gravitational waves are created any time big masses spin, collide or explode. Matter crashing into a black hole, for example, would do it. So would two black holes colliding. If astronomers could monitor gravitational waves coming from a super-massive black hole, they could learn how it grows and evolves. Unfortunately, these waves are hard to measure. If a gravitational wave traveled from the black hole at the center of our galaxy and passed through your body, it would stretch and compress you by an amount far less than the width of an atom. LISA, however, will be able to detect such tiny compressions.

An artist's impression of the LISA observatory in space.
An artists impression of the LISA observatory in space. LISA consists of three spacecraft separated by 5 million kilometers.

LISA consists of three spacecraft flying in formation -- a giant triangle 5 million kilometers on each side. One of the spacecraft will shoot laser beams at the other two. Those two will echo the laser signal right back. By comparing the echoes to the original signal, onboard instruments can sense changes in the size of the triangle as small as
0.0000000002 meters (20 picometers). With such sensitivity, astronomers might detect gravitational waves from all kinds of cosmic sources. The first, however, will probably be black holes. Will "feeling" the ripples from such objects finally solve their mystery, or lead to more questions? Only time will tell. Scientists hope to launch the LISA mission in 2011.

LISA Mission