{"id":89850,"date":"2024-03-11T22:58:03","date_gmt":"2024-03-11T20:58:03","guid":{"rendered":"https:\/\/www.lovendal.ro\/wp52\/?p=89850"},"modified":"2024-03-11T22:58:03","modified_gmt":"2024-03-11T20:58:03","slug":"o-exoplaneta-aflata-la-580-de-ani-lumina-de-terra-ar-putea-avea-anotimpuri-ca-ale-noastre","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/o-exoplaneta-aflata-la-580-de-ani-lumina-de-terra-ar-putea-avea-anotimpuri-ca-ale-noastre\/","title":{"rendered":"O exoplanet\u0103 aflat\u0103 la 580 de ani-lumin\u0103 de Terra ar putea avea anotimpuri ca ale noastre"},"content":{"rendered":"

\"\"<\/a>De\u0219i Universul este imens, exist\u0103 lumi care sunt foarte asem\u0103n\u0103toare cu P\u0103m\u00e2ntul. O exoplanet\u0103 la 580 de ani-lumin\u0103 distan\u0163\u0103 de a noastr\u0103 ar putea avea anotimpuri ca cele de aici, de pe Terra. Aceste condi\u021bii ar putea cre\u0219te \u0219ansele de via\u021b\u0103 \u00een acea exoplanet\u0103?<\/p>\n

Prim\u0103vara, vara, toamna \u0219i iarna: anotimpurile P\u0103m\u00e2ntului se schimb\u0103 la fiecare c\u00e2teva luni, aproximativ \u00een aceea\u0219i perioad\u0103 \u00een fiecare an. Este u\u0219or s\u0103 vezi acest ciclu aici, pe P\u0103m\u00e2nt, dar nu toate planetele au o schimbare regulat\u0103 a anotimpurilor. De ce P\u0103m\u00e2ntul are anotimpuri regulate \u0219i alte planete nu?<\/p>\n

Se pare c\u0103 modelul regulat al anotimpurilor P\u0103m\u00e2ntului este unic. Axa de rota\u021bie \u00een jurul c\u0103reia se rote\u0219te P\u0103m\u00e2ntul, de-a lungul polilor nord \u0219i sud, nu este complet aliniat\u0103 cu axa vertical\u0103 perpendicular\u0103 pe orbita P\u0103m\u00e2ntului \u00een jurul Soarelui. Aceast\u0103 \u00eenclinare u\u0219oar\u0103 are implica\u021bii mari pentru orice, de la anotimp la ciclurile glaciare. M\u0103rimea acestei \u00eenclin\u0103ri poate chiar determina dac\u0103 o planet\u0103 este locuibil\u0103 pentru via\u021b\u0103.<\/p>\n

C\u00e2nd o planet\u0103 are o aliniere perfect\u0103 \u00eentre axa pe care orbiteaz\u0103 \u0219i axa de rota\u021bie, cantitatea de lumin\u0103 solar\u0103 pe care o prime\u0219te este fix\u0103 \u200b\u200bpe m\u0103sur\u0103 ce orbiteaz\u0103 Soarele, presupun\u00e2nd c\u0103 forma sa orbital\u0103 este un cerc. Deoarece anotimpurile apar datorit\u0103 varia\u021biilor cantit\u0103\u021bii de lumin\u0103 solar\u0103 care ajunge la suprafa\u021ba planetei, o planet\u0103 perfect aliniat\u0103 nu ar avea anotimpuri. Dar P\u0103m\u00e2ntul nu este perfect aliniat pe axa sa. Aceast\u0103 mic\u0103 nealiniere, numit\u0103 oblicitate, este de aproximativ 23 de grade fa\u021b\u0103 de verticala P\u0103m\u00e2ntului. Astfel, emisfera nordic\u0103 prime\u0219te lumin\u0103 solar\u0103 mai intens\u0103 \u00een timpul verii, c\u00e2nd Soarele se afl\u0103 cel mai direct deasupra emisferei nordice. Apoi, pe m\u0103sur\u0103 ce P\u0103m\u00e2ntul continu\u0103 s\u0103 orbiteze \u00een jurul Soarelui, cantitatea de lumin\u0103 solar\u0103 pe care o prime\u0219te emisfera nordic\u0103 scade treptat pe m\u0103sur\u0103 ce se \u00eenclin\u0103 departe de Soare. Acest lucru provoac\u0103 iarna.<\/p>\n

Planetele care se rotesc pe axele lor \u0219i orbiteaz\u0103 \u00een jurul Soarelui arat\u0103 ca ni\u0219te v\u00e2rfuri: se \u00eenv\u00e2rt \u0219i „se apleac\u0103” datorit\u0103 atrac\u021biei gravita\u021bionale a Soarelui. C\u00e2nd un v\u00e2rf se \u00eenv\u00e2rte, po\u021bi vedea c\u0103 nu r\u0103m\u00e2ne perfect vertical \u0219i nemi\u0219cat. Dimpotriv\u0103, poate \u00eencepe s\u0103 se \u00eencline u\u0219or. Aceast\u0103 \u00eenclinare este ceea ce astrofizicienii numesc precesie de spin. Din cauza acestor vibra\u021bii, oblicitatea P\u0103m\u00e2ntului nu este perfect fixat\u0103. Aceste mici varia\u021bii de \u00eenclinare pot avea efecte mari asupra climei P\u0103m\u00e2ntului atunci c\u00e2nd sunt combinate cu mici modific\u0103ri ale formei orbitei P\u0103m\u00e2ntului. Balansarea \u00eenclin\u0103rii \u0219i orice varia\u021bii naturale ale formei orbitei P\u0103m\u00e2ntului pot modifica cantitatea \u0219i distribu\u021bia luminii solare care ajunge pe P\u0103m\u00e2nt. Aceste mici schimb\u0103ri contribuie la schimb\u0103ri mari ale temperaturii planetei de-a lungul a mii sau sute de mii de ani. Acest lucru, la r\u00e2ndul s\u0103u, poate provoca epoci de ghea\u021b\u0103 \u0219i perioade de c\u0103ldur\u0103.<\/p>\n

Cum afecteaz\u0103 varia\u021biile oblicit\u0103\u021bii anotimpurile planetei? O oblicitate sc\u0103zut\u0103, adic\u0103 atunci c\u00e2nd axa de rota\u021bie este aliniat\u0103 cu orientarea planetei pe orbita sa \u00een jurul Soarelui, face ca lumina solar\u0103 s\u0103 fie cea mai intens\u0103 la ecuator \u0219i rar\u0103 \u00een apropierea polului, ca pe P\u0103m\u00e2nt. Pe de alt\u0103 parte, o oblicitate mare – adic\u0103 axa de rota\u021bie a planetei este orientat\u0103 c\u0103tre sau departe de Soare – d\u0103 na\u0219tere la poli extrem de calzi sau reci. \u00cen acela\u0219i timp, ecuatorul se r\u0103ce\u0219te, deoarece Soarele nu str\u0103luce\u0219te deasupra ecuatorului pe tot parcursul anului. Acest lucru are ca rezultat anotimpuri drastic variabile la latitudini mari \u0219i temperaturi sc\u0103zute la ecuator.<\/p>\n

C\u00e2nd o planet\u0103 are o oblicitate mai mare de 54 de grade, ecuatorul ei devine \u00eenghe\u021bat, iar polul s\u0103u se \u00eenc\u0103lze\u0219te. Aceasta se nume\u0219te zonare inversat\u0103 \u0219i este opusul a ceea ce se \u00eent\u00e2mpl\u0103 pe P\u0103m\u00e2nt. Practic, dac\u0103 o oblicitate are varia\u021bii mari \u0219i imprevizibile, varia\u021biile sezoniere de pe planet\u0103 devin greu de prezis. O schimbare mare \u0219i dramatic\u0103 a oblicit\u0103\u021bii poate transforma \u00eentreaga planet\u0103 \u00eentr-un bulg\u0103re de z\u0103pad\u0103, unde totul este acoperit de ghea\u021b\u0103.<\/p>\n

Cercet\u0103torii au descoperit c\u0103 Marte se clatin\u0103 mai mult pe axa sa dec\u00e2t P\u0103m\u00e2ntul, chiar dac\u0103 ambele au aceea\u0219i \u00eenclinare, iar acest lucru are de-a face cu Luna care orbiteaz\u0103 P\u0103m\u00e2ntul. Luna planetei noastre trage de axa de rota\u021bie a P\u0103m\u00e2ntului \u0219i o propulseaz\u0103 \u00eentr-o precesie mai rapid\u0103. Astfel, Luna stabilizeaz\u0103 oblicitatea P\u0103m\u00e2ntului, iar P\u0103m\u00e2ntul nu se clatin\u0103 pe axa sa la fel de mult ca Marte.<\/p>\n

Mii de exoplanete, sau planete din afara sistemului nostru solar, au fost descoperite \u00een ultimele decenii. Cercet\u0103torii au vrut s\u0103 \u00een\u021beleag\u0103 c\u00e2t de locuibile sunt aceste planete \u0219i dac\u0103 aceste exoplanete au \u0219i oblicit\u0103\u021bi sau dac\u0103 au sateli\u0163i pentru a le stabiliza ca P\u0103m\u00e2ntul. Pentru a \u00een\u0163elege acest lucru, s-au efectuat investiga\u021bii asupra varia\u021biilor axei de rota\u021bie a exoplanetelor. Exoplaneta Kepler-186f a fost prima planet\u0103 de dimensiunea P\u0103m\u00e2ntului descoperit\u0103 \u00eentr-o zon\u0103 locuibil\u0103 (o zon\u0103 din jurul unei stele \u00een care poate exista ap\u0103 lichid\u0103 pe suprafa\u021ba planetei, iar via\u021ba poate s\u0103 apar\u0103 \u0219i s\u0103 prospere).<\/p>\n

Spre deosebire de P\u0103m\u00e2nt, Kepler-186f este departe de celelalte planete din sistemul s\u0103u solar. Drept urmare, aceste alte planete au doar un efect slab asupra orbitei \u0219i mi\u0219c\u0103rii sale. Astfel, Kepler-186f are \u00een general o oblicitate fix\u0103, similar\u0103 cu cea a P\u0103m\u00e2ntului. Chiar \u0219i f\u0103r\u0103 o lun\u0103 mare, nu are anotimpuri \u00een schimbare sau imprevizibile precum Marte. Privind \u00een perspectiv\u0103, mai multe cercet\u0103ri asupra exoplanetelor \u00eei vor ajuta pe oamenii de \u0219tiin\u021b\u0103 s\u0103 \u00een\u021beleag\u0103 cum sunt anotimpurile pe marea diversitate de planete din Univers. Rezultatele cercet\u0103rii au fost publicate \u00een revista „The Astronomical Journal”<\/em><\/strong><\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

De\u0219i Universul este imens, exist\u0103 lumi care sunt foarte asem\u0103n\u0103toare cu P\u0103m\u00e2ntul. O exoplanet\u0103 la 580 de ani-lumin\u0103 distan\u0163\u0103 de a noastr\u0103 ar putea avea anotimpuri ca cele de aici, de pe Terra. Aceste condi\u021bii ar putea cre\u0219te \u0219ansele de … <\/p>\n

Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":89851,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11039],"tags":[18761,601,102,8404,5584,3460,1578,18762,952,149,156,4216,105,732,13424,18763,2364,3417,865,3175,2358,1087,366],"class_list":["post-89850","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-astronomie","tag-anotimpuri","tag-apa","tag-astronomie","tag-ecuator","tag-epoca-de-gheata","tag-exoplaneta","tag-gheata","tag-kepler-186f","tag-lumina","tag-luna","tag-marte","tag-orbita","tag-pamant","tag-planeta","tag-pol","tag-precesie","tag-revista","tag-sistem-solar","tag-soare","tag-stele","tag-temperatura","tag-univers","tag-viata","resize-featured-image"],"yoast_head":"\nO exoplanet\u0103 aflat\u0103 la 580 de ani-lumin\u0103 de Terra ar putea avea anotimpuri ca ale noastre - Secretele lui Lovendal<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.lovendal.ro\/wp52\/o-exoplaneta-aflata-la-580-de-ani-lumina-de-terra-ar-putea-avea-anotimpuri-ca-ale-noastre\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"O exoplanet\u0103 aflat\u0103 la 580 de ani-lumin\u0103 de Terra ar putea avea anotimpuri ca ale noastre\" \/>\n<meta property=\"og:description\" content=\"De\u0219i Universul este imens, exist\u0103 lumi care sunt foarte asem\u0103n\u0103toare cu P\u0103m\u00e2ntul. 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