火星之旅
评估前往火星的长期太空飞行所面临的工程和人类挑战——辐射暴露、肌肉和骨骼流失、心理隔离、通信延迟——并评估SETI计划的现状：使用哪些方法、迄今探测到了什么，以及费米悖论是什么。
Evaluate the engineering and human challenges of long-duration spaceflight to Mars — radiation exposure, muscle and bone loss, psychological isolation, communication delays — and assess the current state of the SETI programme: what methods are used, what has been detected so far, and what the Fermi Paradox is
学习证据 / Evidence
- 识别并解释火星任务至少三大挑战：辐射（没有磁层）、低重力导致的肌肉和骨骼流失、心理隔离，以及通信延迟。
- 描述SETI如何搜寻智慧生命（无线电信号、激光脉冲、技术特征），并解释为什么目前没有探测到信号并不能证明它们不存在。
- 陈述费米悖论（“大家都在哪儿？”），并讨论两种对立的解释方案。
- Identifies and explains at least three major challenges of a Mars mission: radiation (no magnetosphere), bone/muscle loss from low gravity, psychological isolation, and delayed communications
- Describes how SETI searches for intelligent life (radio signals, laser pulses, technosignatures) and explains why the lack of detection so far is not proof of absence
- States the Fermi Paradox ('Where is everybody?') and discusses two contrasting proposed resolutions
评估问题 / Assessment
如果问{{name}}是否愿意志愿参加一项为期三年的火星任务，{{name}}能否描述出至少三项必须先解决的重大科学或工程挑战，并解释为什么仅20分钟的通信延迟就几乎会改变整个任务的运作方式？
If {{name}} was asked whether they'd volunteer for a 3-year mission to Mars, could they describe at least three serious scientific or engineering challenges that would need to be solved first — and explain why the 20-minute communication delay alone changes almost everything about how the mission would operate?