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Nasa plans to build a telescope to prevent asteroids from hitting the earth?
The telescope proposed by NASA will be launched in 2025. According to a recent report on the website of Science magazine, NASA plans to build an infrared telescope in the hope that it can monitor asteroids that may collide with the Earth. The telescope will be launched in 2025. This telescope, named "Near-Earth Object Surveillance Mission", will cost 500-600 million US dollars. It is based on the long-brewing "NEOCam" project proposed by 15 years ago. The expected launch time can also meet the requirements of Congress-NASA should "find" 90% potentially dangerous asteroids and comets with a diameter of at least140m by 2029. Researchers say that infrared telescopes are necessary because the experience of the past 65,438+00 years shows that there are more dark asteroids that are almost invisible in visible light but stand out in infrared light than once thought. However, building an infrared telescope may require an increase in NASA's planetary defense budget. Most of the annual budget of $6543.8+$500 million is used for the ongoing "Double Asteroid Redirect Test" (DART) mission. DART is scheduled to launch on 202 1 to test whether the asteroid's orbit can be changed. It is not clear whether the congressional appropriations agency supports NASA's plan and funds the new infrared telescope. The team led by astronomer Amy Mainzer of the University of Arizona is currently in charge of the NEOCam project. In the past 65,438+05 years, with the support of NASA, they improved the electronic equipment and sensors that power the telescope, which can work without active cooling. At the same time, engineers have greatly reduced the "dark current" of the detector, that is, the stray noise generated when the detector works in a dark environment.
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