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esa test craft gets record-breaking gravitational wave result
by：UMeasure
2020-04-10
LISA Pathfinder, proofof-
The conceptual mission of a new method of detecting gravitational waves is five times better than scientists hope.
The European Space Agency launched the LISA Pathfinder in last December to demonstrate the key technology needed to build a space observatory capable of detecting minor fluctuations in gravitational waves-two free falls.
Around about 1.
From Earth to the Sun 5 million kilometers, LISA Pathfinder shows that the two cubes fall freely in space, with accuracy more than five times higher than originally needed.
These test masses act alone under the action of gravity, without other external forces, and are almost stationary to each other.
Their relative acceleration is lower than one in ten billion of the Earth\'s gravity.
Alvaro Jimenez, director of science at ESA, said: \"The test groups of LISA Pathfinder are still at an alarming level of mutual respect now . \".
\"This is the level of control required to observe low levels
Frequency gravitational waves of the future space observatory.
\"Gravitational waves are part of Einstein\'s theory of physics and are tiny oscillations in space-time structures caused by the acceleration of a large number of objects and the movement of the speed of light.
The merger of superstars, black holes and neutron star pairs is a huge cosmic event of all types that can produce gravitational waves.
However, although these events are huge, the impact is small, and when any Earth Observatory is able to register these events, these fluctuations are smaller than a portion of 100 billion.
The only way to measure this fluctuation is to use an extremely precise device. The ground-
Gravitational Wave Observatory based on laser interference (LIGO)
For the first time in September 2015, gravitational waves were directly detected.
LIGO observed a signal that two black holes spiral into one giant object.
The frequency of these waves is about 100Hz, but the theoretical wave should span a wide spectrum.
To detect more waves, the observatory needs to be able to capture frequencies as low as 0. 1 mHZ to 1 Hz.
The Observatory also needs to be able to detect these small fluctuations between objects separated by millions of kilometers, which can only be achieved through space technology.
The space observatory will not be affected by the Earth\'s earthquakes, thermal forces and Earth\'s gravity, a background noise that limits the ground
Based on observation.
Putting two cubes into the free fall in space, scientists can study their relative positions under gravity alone, so that they can find any minor differences.
It\'s not an easy thing even in space.
LISA Pathfinder is an aircraft that revolves around two cubes and can protect them from some external forces, including the pressure of solar wind and sunlight.
\"Not only do we see that the test masses are almost immobile, but we have determined, with unprecedented precision, most of the remaining tiny forces that interfere with them,\" explained Stefano Vitale of Trento University and INFN, Italy, he is the lead researcher at the Mission core payload LISA technology package.
So far, in LISA Pathfinder\'s two-month data, researchers have been able to adjust the test to a higher level of accuracy than expected.
Paul McNamara, LISA Pathfinder project scientist, said: \"The results of the measurements exceeded our most optimistic expectations . \".
\"We reached the level of precision that LISA Pathfinder originally needed on the first day, so we increased the results five times over the next few weeks.
\"The only limitation of the process detection capability is the sensing noise of the laser measurement system used to calculate the position and direction of the free fall.
But the system is also performing better than expected.
\"The performance of the laser instrument has exceeded the level of accuracy required for future gravity --
The wave observatory is more than 100 times, \"said Martin hewesson, senior scientist for LISA Pathfinder from Max Mapu Institute of gravity physics and the University of lebuitz, Hanover, Germany.
\"On the accuracy achieved by LISA Pathfinder, a complete
The scale gravitational wave observatory in space will be able to detect fluctuations caused by the merger of super-mass black holes in galaxies anywhere in the universe, \"said Karsten Danzmann, director of the max Planck Institute of gravity physics, director of the Institute of Gravity Physics, University of lebuitz, Hanover, Germany, and co-
Lead researcher at LISA technology package.
The results were published in the Physics Review Express.
The conceptual mission of a new method of detecting gravitational waves is five times better than scientists hope.
The European Space Agency launched the LISA Pathfinder in last December to demonstrate the key technology needed to build a space observatory capable of detecting minor fluctuations in gravitational waves-two free falls.
Around about 1.
From Earth to the Sun 5 million kilometers, LISA Pathfinder shows that the two cubes fall freely in space, with accuracy more than five times higher than originally needed.
These test masses act alone under the action of gravity, without other external forces, and are almost stationary to each other.
Their relative acceleration is lower than one in ten billion of the Earth\'s gravity.
Alvaro Jimenez, director of science at ESA, said: \"The test groups of LISA Pathfinder are still at an alarming level of mutual respect now . \".
\"This is the level of control required to observe low levels
Frequency gravitational waves of the future space observatory.
\"Gravitational waves are part of Einstein\'s theory of physics and are tiny oscillations in space-time structures caused by the acceleration of a large number of objects and the movement of the speed of light.
The merger of superstars, black holes and neutron star pairs is a huge cosmic event of all types that can produce gravitational waves.
However, although these events are huge, the impact is small, and when any Earth Observatory is able to register these events, these fluctuations are smaller than a portion of 100 billion.
The only way to measure this fluctuation is to use an extremely precise device. The ground-
Gravitational Wave Observatory based on laser interference (LIGO)
For the first time in September 2015, gravitational waves were directly detected.
LIGO observed a signal that two black holes spiral into one giant object.
The frequency of these waves is about 100Hz, but the theoretical wave should span a wide spectrum.
To detect more waves, the observatory needs to be able to capture frequencies as low as 0. 1 mHZ to 1 Hz.
The Observatory also needs to be able to detect these small fluctuations between objects separated by millions of kilometers, which can only be achieved through space technology.
The space observatory will not be affected by the Earth\'s earthquakes, thermal forces and Earth\'s gravity, a background noise that limits the ground
Based on observation.
Putting two cubes into the free fall in space, scientists can study their relative positions under gravity alone, so that they can find any minor differences.
It\'s not an easy thing even in space.
LISA Pathfinder is an aircraft that revolves around two cubes and can protect them from some external forces, including the pressure of solar wind and sunlight.
\"Not only do we see that the test masses are almost immobile, but we have determined, with unprecedented precision, most of the remaining tiny forces that interfere with them,\" explained Stefano Vitale of Trento University and INFN, Italy, he is the lead researcher at the Mission core payload LISA technology package.
So far, in LISA Pathfinder\'s two-month data, researchers have been able to adjust the test to a higher level of accuracy than expected.
Paul McNamara, LISA Pathfinder project scientist, said: \"The results of the measurements exceeded our most optimistic expectations . \".
\"We reached the level of precision that LISA Pathfinder originally needed on the first day, so we increased the results five times over the next few weeks.
\"The only limitation of the process detection capability is the sensing noise of the laser measurement system used to calculate the position and direction of the free fall.
But the system is also performing better than expected.
\"The performance of the laser instrument has exceeded the level of accuracy required for future gravity --
The wave observatory is more than 100 times, \"said Martin hewesson, senior scientist for LISA Pathfinder from Max Mapu Institute of gravity physics and the University of lebuitz, Hanover, Germany.
\"On the accuracy achieved by LISA Pathfinder, a complete
The scale gravitational wave observatory in space will be able to detect fluctuations caused by the merger of super-mass black holes in galaxies anywhere in the universe, \"said Karsten Danzmann, director of the max Planck Institute of gravity physics, director of the Institute of Gravity Physics, University of lebuitz, Hanover, Germany, and co-
Lead researcher at LISA technology package.
The results were published in the Physics Review Express.
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