Terrestrial gravitational wave detectors, such as the famous LIGO, have made very interesting discoveries in the last decade. However, there is a great consensus that it would be very useful to detect this cosmic phenomenon directly from space. For this reason, some space agencies are already getting to work to launch their own projects. One of them is the Taiji mission, of the Chinese Academy of Sciences, with which, in fact, a great step forward has just been taken.
Everything ready for Taiji 2. The Taiji mission consists of three phases. The first was already launched in 2019. For the second, a piece called the full-function interferometer optical core had to be tested. The tests carried out on Earth have gone perfectlyso it is considered that the second phase could be launched as soon as possible. In fact, its launch It was initially scheduled in 2024but it has been suffering delays. Luckily, it seems that now all the pieces are ready.
Three ships in total. The Taiji mission is made up of three ships, strategically placed in space millions of kilometers away. They will all be connected to each other through laser interferometry, so that slight changes in these distances that could be associated with gravitational waves can be detected. The first phase of the mission, in which the interferometry system was analyzed, was launched in 2019.
It is expected to send the second part as soon as possible, in which the first two ships will be put into space. As for the third, in principle the established calendar places its launch in the 2030s.
Better in space than on Earth. Gravitational waves are waves produced in space-time as a result of a catastrophic event. These types of events could be, for example, the merger of neutron stars or the collision of black holes. When this occurs, space-time experiences a disturbance similar to that produced when a stone is thrown into a pond. Those are gravitational waves. The terrestrial observatories, like LIGOthey can detect them, but they have a small limitation. And there could be confusion with seismic noise and other terrestrial interference. In space, that problem disappears.
Taiji to the rescue. According to the tests that have been carried out on Earth and the analyzes of the interferometry system that have already been carried out in space with Taiji-1, this mission is capable of greatly reducing interference. Furthermore, the optical core that has just been tested is capable of detecting disturbances on the order of picometers. That is, on Earth you can discern displacements equivalent to one ten-thousandth of the diameter of a human hair.
Although those distances would change under spatial conditions, it is still highly accurate. Therefore, it is expected to detect even gravitational waves caused by intermediate mass black holes.
Other similar missions. The European Space Agency It also has its own mission aimed at detecting gravitational waves in space. This is LISAa project with which it is planned to do something similar: launch three ships connected by laser interferometry into space. In this case, the launch of all ships is scheduled for 2035, so China could have some advantage. Of course, until the complete triangle is in space, the mission cannot be considered completed. Perhaps Europe will be able to overtake the Asian country.
Image | NOIRLab
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