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我哋而家喺人類歷史嘅轉捩點

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人類處於得到新星球
同失去舊星球之間

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失去嘅舊星球就係我哋稱為家嘅地球

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就算只係過去幾年

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我哋對地球喺宇宙扮演
咩角色嘅知識都增長咗唔少

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美國太空總處嘅開普勒任務

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發現有成千上萬個類似地球嘅行星
圍繞住其他恆星運行

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證明地球只係銀河系
數以千萬宜居行星嘅其中一個

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開普勒係一台太空望遠鏡

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當星體喺恆星前面經過

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會輕微阻擋恆星嘅光線

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令恆星睇起嚟暗啲

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開普勒就係量度呢啲稍為暗淡嘅光線

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開普勒嘅數據可以推算到星體嘅體積

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同埋佢哋同母恆星之間嘅距離

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呢兩樣都有助我哋了解星體

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係唔係好似太陽系類地行星咁
體積小而且佈滿岩石

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以及佢哋從母恆星吸收幾多光

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縱合上述結果

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我哋可以知道
呢啲星球到底適唔適宜住

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但好唔好彩

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喺發現可能宜居嘅星球嘅同時

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我哋地球因為人類而逐漸衰退

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2014 年係有紀錄以嚟最熱嘅一年

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同我哋共處咗成千年嘅冰川同海冰

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將會喺幾十年之內消失

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呢種由我哋造成嘅地球環境改變

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好快就超越我哋可以控制佢哋嘅步伐

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不過我唔係氣候學家，我係天文學家

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我研究星體嘅宜居性

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我希望可以喺地球以外嘅宇宙入面

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搵到有生命嘅地方

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你可以話我搵緊外星級數嘅房地產

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作為一個沉迷搜索宇宙生命嘅人

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我可以話你知

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你越係想搵一個似地球嘅星球

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你越會珍惜我哋嘅地球

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每次有新星球發現

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我哋都會將新星球
同我哋最熟悉嘅星球比較

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即我哋太陽系嘅行星

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試想一下我哋嘅鄰居，火星
細小而且滿佈岩石

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雖然佢距離太陽有啲遠

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但如果火星被開普勒計劃呢類任務發現

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佢可能被人分類做宜居星球

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其實以前，火星的確有可能宜居

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呢個亦係我哋深入研究火星嘅原因

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好似好奇號咁嘅火星探測器
喺火星表面行走

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尋找已知生命之源嘅線索

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而好似 MAVEN 任務一樣嘅軌道探測器

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就收集火星大氣層嘅樣本

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畀我哋了解點解火星唔再宜居

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私人太空旅行公司
依架唔只提供近太空旅行

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亦可能喺將來提供火星移民服務

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但呢啲火星景色
只會令人聯想起地球嘅沙漠

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一個我哋聯想只有開拓者同邊疆嘅地方

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同地球相比，火星嘅環境係幾可怕

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諗下我哋地球尚未殖民嘅沙漠

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呢啲地方比起火星更加之宜居

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就算地球最乾、最高嘅地方

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嗰度嘅空氣都係由幾千里外嘅雨林製造

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都係甜嘅，而且充滿住氧氣

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我擔心呢種殖民火星
同其他星球嘅熱潮

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會引致長期唔好嘅後果

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就係令某啲人相信

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當我哋所知唯一宜居嘅星球
自我毀滅之後

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火星就係我哋嘅救星

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雖然我好鍾意星際探索

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但我同時好唔贊同呢個諗法

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我哋有無數個好理由去火星

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但如果有人同你講
火星係人類嘅後備星球

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就同鐵達尼號嘅船長同你講

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陣間喺救生艇上面會搞派對一樣荒謬

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（笑聲）

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（掌聲）

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多謝

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星際探索同星球保護並唔係矛盾嘅

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佢哋係同一個銀仔嘅兩面︰

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都係去了解、保護同改善將來嘅生活

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我哋呢個世界嘅極端環境
其實等如外星嘅美景

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佢哋甚至更加近我哋屋企

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如果我哋明白點樣可以

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喺地球衝突、唔適宜人住嘅環境以外

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創造同維持宜居空間

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或者，我哋可以做到環境保護

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同時又可以做到更加多

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最後，我留俾大家思考費米悖論

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好多年前，物理學家費米問︰

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宇宙已經存在咗好長時間

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而我哋相信宇宙入面有好多星球

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我哋依家應該搵到外星生物嘅證據

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咁佢哋喺邊？

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其中一個可以解答費米悖論嘅答案係

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喺外星生存嘅生物

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佢哋嘅文明已經進步到
佢哋可以住喺星際之間

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但佢哋睇唔到

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以前一直住開、孕育佢哋文明嘅星球

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有幾重要

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如果覺得星際殖民已經可以拯救到人類

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咁樣實在係狂妄自大

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但星體保護同星際探索
反而可以同時進行

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如果我哋可以將火星
呢個咁惡劣嘅星球變成宜居

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咁保護我哋宜居嘅星球
應該係更加輕易至啱

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多謝

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（掌聲）