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🌍 "Where might the closest aliens to us live?" This is the question that many scientists ask themselves. The Universe is huge and we are far from knowing everything: there must necessarily be other civilizations like ours. This is the famous Fermi paradox: why, while the Sun is younger than many other stars in our galaxy, we have never yet found traces of extraterrestrial civilizations? There must be extraterrestrial civilizations, but where are they? Where do the aliens closest to us live? We are going to discover one of the star systems closest to ours, which seems to gather the ideal conditions to welcome extra-terrestrial life. On this journey, we will observe some remarkable stars that lie between Trappist-1, 40.5 light years away, and our solar system. When we arrive in the Trappist-1 star system, we will study the star Trappist-1a and the 7 exo-planets orbiting it. Together we will see if this amazing planetary system, very similar to our own, could harbor an alien life form and what it would look like. 🔥 As a reminder, the videos are published on SUNDAYS at 6:00 PM. ------------------------- 💥 The Incredible TRAPPIST-1 Star System: - Let's start by observing the star Trappist-1 a, the heart of the Trappist-1 star system. It is also called 2MASS J23062928-0502285. It is an ultra-cold red dwarf, barely larger than Jupiter but much more massive, and much cooler than the Sun. Its diameter would be of 11,5 % that of the Sun and its mass of 8 %. It would be between 3 and 8 billion years old. Strangely enough, it contains a lot of metals (about 109% of the amount of metals in the Sun!), which contradicts the models according to which red dwarfs contain much less metals than stars like the Sun. Stars like Trappist-1 have the capacity to live 400 to 500 times longer than the Sun. While the Sun can live for about 10 billion years, Trappist-1 A can live for 4 to 5 trillion years. When the Universe will be very old and the gas necessary for the formation of stars will be exhausted, Trappist-1 A will certainly be one of the last remaining stars... Enough to make you dizzy! Trappist-1 A was discovered in 1999 by astronomer John Gizis and his colleagues. 16 years later, 3 of the planets orbiting this star were discovered by the Belgian telescope TRAPPIST. The astronomers crossed the information from the two TRAPPIST telescopes, installed in Chile and Morocco, with information from 4 other telescopes based in the Canary Islands, Hawaii and South Africa, and discovered 4 more planets. The Trappist-1 planetary system contains at least 7 rocky planets, all of which have a radius close to that of the Earth and comparable masses. The planets of the Trappist-1 star system orbit at very small distances from their star: they would be, according to the observations, 6 to 40 times closer to their star than Mercury to the Sun! This planetary system is thus very compact: all the planets are on an orbit smaller than that of Mercury. The orbital periods of these 7 planets are very short: they range from one day and a half for planet B to 19 days for planet H, the outermost planet of the planetary system although 6 times closer to its star than Mercury to our Sun. ------------------------- 🎬 On the program today: - 00:00 - Introduction - 01:56 - On the way to the Trappist-1 star system - 03:25 - Barnard's star - 09:07 - Luhman 16 - 13:09 - Epsilon Eridani - 17:29 - HR 4523 - 19:51 - L 98-59 - 22:57 - Trappist-1 star system - 23:48 - Trappist-1 star a - 25:51 - Trappist-1 planetary system - 27:22 - Trappist-1 b - 30:11 - Trappist-1 c - 32:10 - Trappist-1 d - 34:40 - Trappist-1 e - 36:49 - Trappist 1-f - 38:02 - Trappist-1 g - 39:58 - Trappist-1 h - 40:30 - How were the characteristics of these exo planets determined? - 44:52 - Specificities of the Trappist-1 planets - 49:52 - Which planet would be habitable? - 52:43 - What would life be like in the Trappist-1 system? - 56:09 - Could life survive in the Trappist-1 planetary system? - 01:00:53 - Panspermia: the transfer of life from one planet to another - 01:03:10 - What next...? Wondody is an official channel affiliated to the network ©Production Orbinea