宇宙“保洁”有新招，新型推进器实现非接触清除太空垃圾

Core Viewpoint - The increasing risk of collisions due to space debris threatens satellite operations and space missions, prompting the development of a new non-contact, efficient debris removal technology by a Japanese research team [1][2]. Group 1: Space Debris Issue - The problem of space debris is becoming severe, with numerous defunct satellites, rocket remnants, and tiny fragments traveling at speeds exceeding that of bullets, posing significant threats to active satellites and spacecraft [1]. - The uncontrolled debris significantly increases the risk of sustainable human activities in space, highlighting the need for effective removal methods [1]. Group 2: Innovative Technology Development - The research team from Tohoku University has proposed and validated an innovative solution that utilizes plasma ejected from satellites to slow down space debris, encouraging it to deorbit and burn up upon re-entry into the atmosphere [1]. - Traditional methods of debris removal often rely on direct contact, which carries the risk of entanglement; however, the new method using plasma propulsion is gaining attention as a promising alternative [1]. Group 3: Technical Advancements - To enhance deceleration efficiency, the team introduced a special magnetic field structure called "tip" to confine the plasma plume and prevent its dispersion, achieving a deceleration force three times greater than previously reported in simulations [2]. - The propulsion system employs inexpensive and abundant argon gas as the propellant, demonstrating good economic viability and practicality for debris removal [2]. - The development of a "bipolar plasma jet type non-electrode plasma thruster" allows for simultaneous plasma ejection in both the direction of the debris and the opposite direction, counteracting recoil and maintaining the stability of the removal satellite [1][2].