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Aaronvan
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NASA planned to launch LISA to study gravitational waves, which are ripples in space-time caused by the acceleration of massive objects such as black holes and neutron stars. LISA would have been able to detect these waves and provide valuable insights into the nature of the universe.
The main reason for the cancellation of the LISA mission was budget constraints. The project was estimated to cost around $4.7 billion, and NASA had to prioritize other missions with more immediate goals and lower costs.
While there are currently no plans to launch a mission exactly like LISA, NASA is still committed to studying gravitational waves. They are currently developing the Laser Interferometer Space Antenna (LISA) Pathfinder, which will test the technology needed for a future LISA-like mission.
NASA had been working on LISA for over two decades, with the project reaching its final stages of development. The spacecraft and instruments were already built, and they were in the process of integrating and testing them before the launch in 2034.
While there are no concrete plans, several other space agencies and organizations are also working on developing their own gravitational wave detectors. These include the European Space Agency's Laser Interferometer Space Antenna (LISA) and the Chinese Academy of Sciences' Taiji program.