{"id":42001,"date":"2026-02-02T09:00:00","date_gmt":"2026-02-02T08:00:00","guid":{"rendered":"https:\/\/www.11onze.cat\/?p=42001"},"modified":"2026-02-02T09:46:13","modified_gmt":"2026-02-02T08:46:13","slug":"gold-oxygen-mars","status":"publish","type":"post","link":"https:\/\/www.11onze.cat\/en\/magazine\/gold-oxygen-mars\/","title":{"rendered":"How gold helps create oxygen on Mars"},"content":{"rendered":"<div class=\"component text\">\n  <div class=\"container\">\n\n\n    <div class=\"row\">\n      <div class=\"col  col-lg-8  offset-lg-2\">\n        <h3><b>La NASA es planteja enviar una missi\u00f3 tripulada a Mart en les pr\u00f2ximes d\u00e8cades. Per a aix\u00f2 ser\u00e0 necessari crear oxigen a partir del di\u00f2xid de carboni present en l&#8217;aire del planeta vermell. Part del dispositiu que ho fa possible \u00e9s d&#8217;or.<\/b><\/h3>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Per les seves propietats, <\/span><b>l&#8217;or ha tingut i continua tenint un paper fonamental en l&#8217;exploraci\u00f3 espacial<\/b><span style=\"font-weight: 400;\">. Per posar un exemple, aquest metall noble ja va ser b\u00e0sic en el primer <\/span><a href=\"https:\/\/nssdc.gsfc.nasa.gov\/planetary\/gemini_4_eva.html\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">passeig<\/span><\/a><span style=\"font-weight: 400;\"> espacial de la NASA l\u2019any 1965. El cable que unia al coronel Ed White a la Gemini 4 estava recobert d&#8217;or per assegurar la seva subjecci\u00f3 i la visera del seu vestit tamb\u00e9 estava revestida d&#8217;or per protegir els seus ulls de la radiaci\u00f3 solar.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">La durabilitat i estabilitat de l&#8217;or, aix\u00ed com el fet que no s&#8217;oxidi i sigui un bon conductor de l&#8217;electricitat i de la calor, han portat als responsables de m\u00faltiples projectes espacials a utilitzar-lo amb finalitats molt diverses.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h3><b>Missi\u00f3 a Mart<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Una de les grans aspiracions de la NASA per a les pr\u00f2ximes d\u00e8cades \u00e9s enviar <\/span><b>una <\/b><b><a href=\"https:\/\/mars.nasa.gov\/\" target=\"_blank\" rel=\"noopener\">missi\u00f3<\/a> <\/b><b>tripulada a Mart<\/b><span style=\"font-weight: 400;\">. I ser\u00e0 necess\u00e0ria una gran quantitat d&#8217;oxigen, tant per fer cremar el combustible de la nau com per mantenir vius als astronautes.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">La millor opci\u00f3 per no haver de transportar tot aquest oxigen des de la Terra \u00e9s crear-lo en el mateix planeta vermell. I es pot aconseguir a partir del di\u00f2xid de carboni que constitueix la major part de l&#8217;aire marci\u00e0. Per aix\u00f2, el vehicle robotitzat Perseverance, que va arribar a Mart el febrer de 2021, incorpora <\/span><b>un instrument anomenat <\/b><a href=\"https:\/\/mars.nasa.gov\/mars2020\/spacecraft\/instruments\/moxie\/\" target=\"_blank\" rel=\"noopener\"><b>MOXIE<\/b><\/a><b> que produeix oxigen a partir del di\u00f2xid de carboni<\/b><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Com explica el Dr. Michael Hecht, investigador principal d&#8217;aquest projecte, <\/span><b>\u201cl&#8217;or \u00e9s fonamental per al funcionament de MOXIE\u201d<\/b><span style=\"font-weight: 400;\">, que pesa 17 quilograms i t\u00e9 una grand\u00e0ria similar al d&#8217;una bateria de cotxe. La carcassa de MOXIE est\u00e0 feta d&#8217;or perqu\u00e8 aquest metall \u201c\u00e9s extraordin\u00e0riament estable, no s&#8217;oxida ni es corroeix amb facilitat i \u00e9s un excel\u00b7lent conductor de la calor\u201d, segons Hecht. Aquesta \u00faltima propietat \u00e9s crucial, ja que en alguns moments del dia la temperatura \u00e9s massa alta perqu\u00e8 pugui funcionar aquest dispositiu.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><iframe loading=\"lazy\" title=\"MOXIE&#039;s mission creating oxygen on Mars: The Golden Thread\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/35NZGrxyS8c?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>&nbsp;<\/p>\n<h3><b>Un assaig a petita escala<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Quan MOXIE est\u00e0 en marxa, el Perseverance roman pr\u00e0cticament inactiu, ja que es requereix molta energia per separar les mol\u00e8cules de CO\u2082. Per aix\u00f2, <\/span><b>MOXIE no funciona molt sovint, nom\u00e9s una vegada al mes o cada dos mesos<\/b><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">MOXIE triga unes dues hores a estar operatiu perqu\u00e8 una de les peces necess\u00e0ries per al proc\u00e9s ha d&#8217;escalfar-se fins a assolir els 800 \u00b0C. Despr\u00e9s, <\/span><b>la c\u00e0rrega de les bateries del vehicle permet produir oxigen durant una hora<\/b><span style=\"font-weight: 400;\">, en la qual a vegades els responsables del projecte canvien el voltatge o la velocitat del compressor per aprendre m\u00e9s sobre l&#8217;instrument.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">En aquest temps <\/span><b>MOXIE pot produir entre 6 i 10 grams d&#8217;oxigen<\/b><span style=\"font-weight: 400;\">. Es tracta d&#8217;una quantitat molt petita tenint en compte que cadascun de nosaltres consumim entre 10 i 20 grams d&#8217;oxigen cada hora, per\u00f2 permet a la NASA comprovar que aquesta tecnologia cr\u00edtica funciona de manera adequada sobre el terreny.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">De fet, <\/span><b>el principal objectiu de MOXIE \u00e9s demostrar que es pot confiar en aquesta tecnologia<\/b><span style=\"font-weight: 400;\"> per nodrir d\u2019oxigen a futures tripulacions d&#8217;astronautes i retornar-los a casa sans i estalvis. Tamb\u00e9 aprendre molts detalls t\u00e8cnics sobre com construir un futur sistema MOXIE molt m\u00e9s gran.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h3><b>Dos viatges per a una missi\u00f3<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Tenint en compte les \u00f2rbites de la Terra i de Mart, <\/span><b>el moment \u00f2ptim per afrontar un viatge entre tots dos planetes es produeix cada vint-i-sis mesos<\/b><span style=\"font-weight: 400;\">. Una de les idees que es plantegen per dur a terme una missi\u00f3 tripulada \u00e9s enviar primer tot el material necessari, tant el lloc on viurien els astronautes a Mart com els vehicles d&#8217;exploraci\u00f3, una central el\u00e8ctrica i potser un \u201cgran\u201d MOXIE, i vint-i-sis mesos despr\u00e9s enviar als astronautes.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">D&#8217;aquesta manera, la base estaria instal\u00b7lada uns vint mesos abans del viatge dels astronautes. <\/span><b>Aquest \u201cgran\u201d MOXIE hauria de generar i emmagatzemar una part important de l&#8217;oxigen que els astronautes i el seu coet necessitarien<\/b><span style=\"font-weight: 400;\"> en la missi\u00f3. Aix\u00f2 significa que el dispositiu hauria de produir entre 2.000 i 3.000 grams d&#8217;oxigen per hora, enfront dels 6-10 grams que produeix el MOXIE actual. I hauria de fer-ho gaireb\u00e9 sense parar.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Cal tenir en compte que <\/span><b>el coet d&#8217;ascens per marxar de Mart requeriria entre 25 i 30 tones d&#8217;oxigen<\/b><span style=\"font-weight: 400;\"> i que els astronautes podrien respirar entre 2 i 3 tones durant la seva estada de divuit mesos al planeta vermell fins que arrib\u00e9s el moment \u00f2ptim per tornar.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">El primer cap\u00edtol de la s\u00e8rie <\/span><a href=\"https:\/\/thegoldenthread.gold.org\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">The Golden Thread<\/span><\/a><span style=\"font-weight: 400;\">, que aborda la import\u00e0ncia que ha tingut i t\u00e9 l&#8217;or en diferents \u00e0mbits de la nostra vida, incideix en el paper fonamental que ha jugat aquest metall preci\u00f3s en l&#8217;exploraci\u00f3 de l&#8217;espai.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><iframe loading=\"lazy\" title=\"The Golden Thread: Episode 1, The Next Frontier\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/WqML1-oYU98?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>&nbsp;<\/p>\n<p><b>Si vols descobrir la millor opci\u00f3 per protegir els teus estalvis, entra a <\/b><a href=\"https:\/\/serveis.11onze.cat\/preciosos-11onze\" target=\"_blank\" rel=\"noopener\"><b>Preciosos 11Onze<\/b><\/a><b>. 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