This is some cool stuff. Einstein, guessed that the speed of gravity was the same as the speed of light....and was correct!
Way cool stuff......Melon....could you translate this all for me?????
Einstein right again
Associated Press
Seattle ? Einstein was right. The speed of gravity matches the speed of light, according to astronomers who took advantage of a rare planetary alignment to measure one of the fundamental forces of nature.
Edward Fomalout of the National Radio Astronomy Observatory and Sergei Kopeikin of the University of Missouri measured the amount that light from a distant star was deflected by the gravity of Jupiter as the planet passed in front of the star.
Albert Einstein, who formulated basic theories about space, time and relativity, had assumed that gravity moved with the speed of light, about 300,000 kilometres a second, "but until now, no one had measured it," said Mr. Kopeikin.
"Einstein was right, of course," said Mr. Fomalout.
The measurement is one of the last fundamental constants in physics to be established and Mr. Fomalout admitted, "gravity is not well understood."
The researchers used 10 radio telescopes scattered across the Earth from Hawaii to Germany to precisely measure how light from a distant quasar, a type of star, was bent as it passed by Jupiter on its way to the Earth. Jupiter is in the precise position for such a measurement only once a decade.
To make the measurement, the instruments had to detect a minute deflection of the light. Mr. Fomalout compared the required precision to being able to measure the size of a silver dollar sitting on the moon's surface, or measuring the width of a human hair from 400 kilometres away.
Craig Hogan, a University of Washington astronomer, said the achievement "is an important advance for physics," but he predicted that new techniques will be developed that will measure gravity's speed even more accurately.
"You can expect a series of experiments now," he said.
Mr. Fomalout and Mr. Kopeikin said their results are accurate within about 20 per cent.
Knowing the precise speed of gravity is important to physicists testing such modern ideas as the superstring, which holds that fundamental particles in the universe are made up of small vibrating loops or strings. It also affects some basic space-time theories.
http://www.upi.com/view.cfm?StoryID=20030107-080949-3274r
http://www.newscientist.com/news/news.jsp?id=ns99993232
Way cool stuff......Melon....could you translate this all for me?????
Einstein right again
Associated Press
Seattle ? Einstein was right. The speed of gravity matches the speed of light, according to astronomers who took advantage of a rare planetary alignment to measure one of the fundamental forces of nature.
Edward Fomalout of the National Radio Astronomy Observatory and Sergei Kopeikin of the University of Missouri measured the amount that light from a distant star was deflected by the gravity of Jupiter as the planet passed in front of the star.
Albert Einstein, who formulated basic theories about space, time and relativity, had assumed that gravity moved with the speed of light, about 300,000 kilometres a second, "but until now, no one had measured it," said Mr. Kopeikin.
"Einstein was right, of course," said Mr. Fomalout.
The measurement is one of the last fundamental constants in physics to be established and Mr. Fomalout admitted, "gravity is not well understood."
The researchers used 10 radio telescopes scattered across the Earth from Hawaii to Germany to precisely measure how light from a distant quasar, a type of star, was bent as it passed by Jupiter on its way to the Earth. Jupiter is in the precise position for such a measurement only once a decade.
To make the measurement, the instruments had to detect a minute deflection of the light. Mr. Fomalout compared the required precision to being able to measure the size of a silver dollar sitting on the moon's surface, or measuring the width of a human hair from 400 kilometres away.
Craig Hogan, a University of Washington astronomer, said the achievement "is an important advance for physics," but he predicted that new techniques will be developed that will measure gravity's speed even more accurately.
"You can expect a series of experiments now," he said.
Mr. Fomalout and Mr. Kopeikin said their results are accurate within about 20 per cent.
Knowing the precise speed of gravity is important to physicists testing such modern ideas as the superstring, which holds that fundamental particles in the universe are made up of small vibrating loops or strings. It also affects some basic space-time theories.
http://www.upi.com/view.cfm?StoryID=20030107-080949-3274r
http://www.newscientist.com/news/news.jsp?id=ns99993232
