0:00:01.600,0:00:02.834 Supported by 0:00:02.834,0:00:04.350 Supported by[br]Protocol Labs 0:00:04.350,0:00:05.419 Supported by[br]Protocol Labs[br]Follow your curiosity. 0:00:05.419,0:00:09.187 Supported By[br]Protocol Labs[br]Follow your curiosity.[br]Lead humanity forward. 0:00:09.187,0:00:09.437 Protocol Labs[br]Follow your curiosity.[br]Lead humanity forward. 0:00:09.437,0:00:09.687 Follow your curiosity.[br]Lead humanity forward. 0:00:16.820,0:00:19.129 "In all the universe, 0:00:19.129,0:00:24.540 "In all the universe,[br]there stands only one known tree of life." 0:00:31.421,0:00:34.443 "Does it stand alone? 0:00:34.443,0:00:40.311 "Does it stand alone?[br]Or is it part of a vast cosmic wilderness?" 0:00:46.038,0:00:52.537 "Imagine a museum[br]containing every type of life in the universe." 0:00:58.362,0:01:00.757 "What strange things would such a museum hold?" 0:01:16.257,0:01:18.667 "What is possible under the laws of nature?" 0:01:39.767,0:01:40.906 LIFE 0:01:40.906,0:01:45.610 LIFE BEYOND 0:01:49.016,0:01:49.885 CHAPTER II 0:01:49.885,0:01:55.406 CHAPTER II[br]The Museum Of Alien Life 0:02:02.805,0:02:03.657 To have any hope- 0:02:03.657,0:02:05.506 of finding alien life, 0:02:05.537,0:02:07.408 we have to know what to look for. 0:02:12.060,0:02:13.945 But where do we begin? 0:02:15.303,0:02:16.446 How do we narrow down... 0:02:16.568,0:02:18.068 a seemingly infinite set- 0:02:18.068,0:02:20.175 of possibilities... 0:02:27.310,0:02:29.968 There's one thing we know for sure... 0:02:30.683,0:02:32.045 nature will have to play- 0:02:32.075,0:02:33.375 by her own rules. 0:02:36.791,0:02:38.166 No matter how strange 0:02:38.196,0:02:39.806 alien life might be, 0:02:40.386,0:02:41.180 is going to be limited- 0:02:41.220,0:02:42.596 by the same physical... 0:02:42.606,0:02:44.756 and chemical laws that we are.... 0:02:46.952,0:02:47.014 6 0:02:47.014,0:02:47.077 6 C 0:02:47.077,0:02:47.139 6 CO 0:02:47.139,0:02:47.202 6 CO² 0:02:47.202,0:02:47.264 6 CO² + 0:02:47.264,0:02:47.327 6 CO² + 6 0:02:47.327,0:02:47.389 6 CO² + 6 H 0:02:47.389,0:02:47.452 6 CO² + 6 H² 0:02:47.452,0:02:47.514 6 CO² + 6 H²O 0:02:47.514,0:02:47.577 6 CO² + 6 H²O + 0:02:47.577,0:02:47.639 6 CO² + 6 H²O + L 0:02:47.639,0:02:47.702 6 CO² + 6 H²O + Li 0:02:47.702,0:02:47.764 6 CO² + 6 H²O + Lig 0:02:47.764,0:02:47.827 6 CO² + 6 H²O + Ligh 0:02:47.827,0:02:47.889 6 CO² + 6 H²O + Light 0:02:47.889,0:02:47.952 6 CO² + 6 H²O + Light → 0:02:47.952,0:02:48.014 6 CO² + 6 H²O + Light → C 0:02:48.014,0:02:48.077 6 CO² + 6 H²O + Light → C⁶ 0:02:48.077,0:02:48.139 6 CO² + 6 H²O + Light → C⁶H 0:02:48.139,0:02:48.202 6 CO² + 6 H²O + Light → C⁶H¹ 0:02:48.202,0:02:48.264 6 CO² + 6 H²O + Light → C⁶H¹² 0:02:48.264,0:02:48.326 6 CO² + 6 H²O + Light → C⁶H¹²O 0:02:48.326,0:02:48.389 6 CO² + 6 H²O + Light → C⁶H¹²O⁶ 0:02:48.389,0:02:48.451 6 CO² + 6 H²O + Light → C⁶H¹²O⁶ + 0:02:48.451,0:02:48.514 6 CO² + 6 H²O + Light → C⁶H¹²O⁶ + 6 0:02:48.514,0:02:48.576 6 CO² + 6 H²O + Light → C⁶H¹²O⁶ + 6 O 0:02:48.576,0:02:51.613 6 CO² + 6 H²O + Light → C⁶H¹²O⁶ + 6 O² 0:02:51.613,0:02:52.312 On top of this,[br]6 CO² + 6 H²O + Light → C⁶H¹²O⁶ + 6 O² 0:02:52.312,0:02:52.733 On top of this, 0:02:53.244,0:02:53.694 each alien environment will further limit- 0:02:53.694,0:02:55.239 each alien environment will further limit-[br]-Hydrogen- 0:02:55.239,0:02:55.672 each alien environment will further limit-[br]-Oxygen- 0:02:55.672,0:02:57.374 what kinds of life forms can evolve there.[br]-Oxygen- 0:02:57.374,0:02:59.376 what kinds of life forms can evolve there.[br]-Nitrogen- 0:03:06.992,0:03:09.189 Despite these natural boundaries, 0:03:09.243,0:03:12.206 the possibilities are staggering to imagine. 0:03:14.235,0:03:15.640 Trillions of planets, 0:03:15.778,0:03:17.878 each a unique cauldron of chemicals, 0:03:17.924,0:03:23.076 undergoing their own complex evolution. 0:03:28.300,0:03:33.548 To guide our thinking, this museum of alien life[br]will be divided into two exhibits: 0:03:35.768,0:03:40.185 Life as we know it: home to beings [br]with bio-chemistries like ours. 0:03:41.964,0:03:47.921 And life as we don't know it: home to beings [br]that challenge our concept of life itself. 0:03:54.132,0:03:56.629 Before we venture too far [br]into the unknown, 0:03:57.103,0:03:58.587 we have to ask ourselves: 0:04:00.136,0:04:03.005 what if alien life is more [br]like ours than we think? 0:04:10.820,0:04:12.729 EXHIBIT I 0:04:12.729,0:04:15.017 EXHIBIT I[br]LIFE AS WE KNOW IT 0:04:15.017,0:04:15.435 EXHIBIT I[br]LIFE AS WE KNOW IT[br]CARBON & WATER BASED 0:04:15.435,0:04:20.798 If there's one feature that unites us with [br]these other specimes in this museum, it's carbon. 0:04:25.007,0:04:29.380 Carbon is ubiquitous, it's one of the [br]most common elements in the universe, 0:04:29.745,0:04:32.751 and is very good at forming [br]large stable molecules. 0:04:37.293,0:04:41.502 Carbon has the rare ability to form four way[br]bounds with other elements 0:04:41.807,0:04:44.708 and to bind to itself in [br]long, stable chains; 0:04:46.424,0:04:49.624 enabling the formation of [br]huge complex molecules. 0:04:56.197,0:04:59.093 This versatility makes carbon the center piece 0:04:59.093,0:05:01.130 in the moleculary machinery of life. 0:05:03.520,0:05:07.742 And the same carbon compounds that we use[br]have been found far from Earth, 0:05:08.736,0:05:10.087 clinging to meteorites 0:05:12.359,0:05:15.623 and floating in far off [br]clouds of cosmic dust. 0:05:18.670,0:05:23.518 The building blocks of life drifting [br]like snow through the universe. 0:05:30.162,0:05:34.920 And if alien life has selected other carbon[br]compounds for the biochemistry, 0:05:35.783,0:05:37.413 they will have plenty to choose from. 0:05:42.088,0:05:47.570 Scientists recently identified over a [br]million possible alternatives to DNA: 0:05:48.588,0:05:49.862 all carbon based. 0:05:57.948,0:06:00.795 If we ever discover other [br]carbon based life forms, 0:06:01.650,0:06:03.973 we will be fundamentally related. 0:06:07.928,0:06:09.840 They will be our cosmic brother. 0:06:13.296,0:06:15.137 But would they look anything like us? 0:06:19.975,0:06:21.742 If they hail from Earth like planets, 0:06:22.857,0:06:24.471 we could share even more in common, 0:06:25.065,0:06:26.417 than just our biochemistry. 0:06:29.826,0:06:33.104 What would life be like in another[br]planets, if its evolved? 0:06:33.566,0:06:36.246 Would it be like, the world [br]today here on Earth? 0:06:37.477,0:06:38.736 Or would be completely different? 0:06:40.504,0:06:42.121 There are those, who argue that 0:06:42.456,0:06:44.470 from the argument of convergent evolution, 0:06:44.803,0:06:50.206 if conditions on other planets are similar to here, then we will see very similar life forms; 0:06:54.726,0:06:58.236 animal and plant-like organisms, that look very familiar. 0:07:12.238,0:07:16.618 On Earth, certain features like eyesight, echo-location and flight 0:07:16.628,0:07:20.812 have evolved multiple times, independently, in different species. 0:07:23.648,0:07:28.978 This process of convergent evolution could extend to alien planets like Earth, 0:07:29.222,0:07:32.242 where creatures share similar environmental pressures. 0:07:35.632,0:07:40.372 It's no guarantee, but there could be certain universalities of life; 0:07:44.337,0:07:48.337 the greatest hits of evolution on repeat across the Universe. 0:07:58.040,0:08:02.040 Each feature would be a tune to its local environment. 0:08:02.798,0:08:06.798 Dimly lit planets would produce huge eyes to suck in extra light, like nocturnal mammals.