标题： 星际物体3I/ATLAS是外星技术吗？ 显示英文标题

标题： Is the Interstellar Object 3I/ATLAS Alien Technology?

摘要： 在它穿过我们太阳系的早期阶段，最近发现的星际闯入者3I/ATLAS表现出从光度和天体测量观测中确定的各种异常特征。 作为很大程度上的教学练习，本文我们对3I/ATLAS的天体力学进行了进一步分析，并假设该物体可能是技术性的，并且可能具有敌意，这符合“黑暗森林”对“费米悖论”的解决方式。 我们表明，3I/ATLAS出人意料地接近金星、火星和木星，概率为$\lesssim 0.005$%。 此外，3I/ATLAS轨道平面相对于黄道面的低逆行倾角为外星智慧文明（ETI）提供了各种好处，因为它允许该物体相对不受阻碍地进入我们的行星。 在近日点时，从地球看，3I/ATLAS被太阳遮挡，这将使其能够进行秘密的逆向太阳奥伯特机动，这是星际飞船减速并留在太阳引力束缚内的最佳高推力策略。 对地球的最佳拦截将涉及在2025年11月下旬/12月初到达，并且，以距离太阳1天文单位处归一化的非引力加速度为$\sim{5.9} \times 10^{-5}$ 天文单位/天$^{-2}$，将表明其意图拦截木星，不会偏离其轨道太远，并在近日点后与之会合的策略。 显示英文摘要

摘要： At this early stage of its passage through our Solar System, 3I/ATLAS, the recently discovered interstellar interloper, has displayed various anomalous characteristics, determined from photometric and astrometric observations. As largely a pedagogical exercise, in this paper we present additional analysis into the astrodynamics of 3I/ATLAS, and hypothesize that this object could be technological, and possibly hostile as would be expected from the 'Dark Forest' resolution to the 'Fermi Paradox'. We show that 3I/ATLAS approaches surprisingly close to Venus, Mars and Jupiter, with a probability of $\lesssim 0.005$\%. Furthermore the low retrograde tilt of 3I/ATLAS's orbital plane to the ecliptic offers various benefits to an Extra-terrestrial Intelligence (ETI), since it allows the object access to our planet with relative impunity. The eclipse by the Sun from Earth of 3I/ATLAS at perihelion, would allow it to conduct a clandestine reverse Solar Oberth Manoeuvre, an optimal high-thrust strategy for interstellar spacecraft to brake and stay bound to the Sun. An optimal intercept of Earth would entail an arrival in late November/early December of 2025, and also, a non-gravitational acceleration of $\sim{5.9} \times 10^{-5}$ au day$^{-2}$, normalized at 1 au from the Sun, would indicate an intent to intercept the planet Jupiter, not far off its path, and a strategy to rendezvous with it after perihelion.