Ka Uhi ʻUmekaumaha ma waena o nā Honua: Ka Hula Cosmic
Mai nā wahi mālie o ka lewa waho a hiki i nā kikowaena mānoanoa o nā galaxies, hoʻokahi mana e noho aliʻi ana—ʻo ia ka mana o ka umekaumaha. Ke hōʻike nei iā ia iho i ka huki like ʻana ma waena o nā mea me ka nuipa, ʻo ka umekaumaha ke kumu o nā hula lani, e kuhikuhi ana i nā kaapuni honua a hoʻohālike i ke ʻano o ke ao holoʻokoʻa. He kuleana hoihoi loa kēia mana ʻike ʻole ʻia akā aia ma nā wahi āpau i ka hoʻomalu ʻana i nā pilina ma waena o nā hōkūhele. ʻO ka hoʻomaopopo ʻana i ka huki umekaumaha ma waena o nā hōkūhele e hāʻawi i nā ʻike hohonu i nā hana kumu o ko kākou cosmos.
Ke Kānāwai Kumu o ka Umekaumaha
Ma ka puʻuwai o ka huki ʻumekaumaha aia ke kānāwai honua o Isaac Newton no ka umekaumaha, i hōʻike ʻia i ke kenekulia 17. Wahi a Newton, ʻo ka ikaika umekaumaha ma waena o nā nuipa ʻelua e pili pono ana i ka huahana o ko lākou mau nuipa a kūlike ʻole i ka huinahā o ka mamao e hoʻokaʻawale ana iā lākou. Ma ke ʻano makemakika:
\[ F = G \frac{m_1 m_2}{r^2} \]
Maanei, ʻo \(F\) ka ikaika umekaumaha, ʻo \(G\) ke kūpaʻa umekaumaha (\(6.67430 \times 10^{-11} \, \text{m}^3 \text{kg}^{-1} \text{s}^{-2}\)), ʻo \(m_1\) a me \(m_2\) nā nuipaʻa, a ʻo \(r\) ka mamao ma waena o ko lākou mau kikowaena nuipaʻa.
Hoʻopuni kēia ʻano hana maʻalahi a nani hoʻi i ke ʻano o ka huki ʻumekaumaha, e paʻa ana no nā pilina ma nā unahi honua a me ka cosmic.
Nā Hana Pilikino Umekaumaha ma ka ʻŌnaehana Lā
I mea e hoʻomaopopo maoli ai i ka huki ʻana o ka umekaumaha ma waena o nā hōkūhele, ʻaʻohe mea e pono ai ke nānā aku ma mua o ko kākou ʻōnaehana lā ponoʻī, kahi keʻena hoʻokolohua lani e launa pū ana me nā pilina. Hoʻopuka kēlā me kēia hōkūhele i kahi huki umekaumaha ma luna o nā hōkūhele ʻē aʻe, a ʻo ka hopena hope loa he ʻōnaehana paʻakikī, akā i hoʻonohonoho ʻia, o nā orbits a me nā neʻe.
Eia kekahi laʻana, e noʻonoʻo i ka Honua a me Iupita. ʻOiai he maalea ka ikaika umekaumaha o Iupita ma ka mamao o ka Honua ma kahi o 778 miliona kilomita, he kuleana koʻikoʻi kona i ke kūpaʻa o ka orbit o ka Honua a me ke axial tilt o ko kākou honua. ʻOiai kēia huki kaua umekaumaha ma waena o nā hōkūhele, ʻo ko lākou huki umekaumaha ikaika loa i ka lā e hōʻoiaʻiʻo ana e noho lākou i nā orbit elliptical i wānana ʻia.
Nā Hoʻopilikia a me ka Neʻe Honua
I loko o ka ʻōnaehana lā, ʻo ka pilina umekaumaha ma waena o nā hōkūhele e hāʻawi i nā haunaele—nā ʻokoʻa iki mai ko lākou mau orbit elliptical kūpono. He mea koʻikoʻi kēia mau haunaele no ka pololei i nā mechanics lani a ʻo ia ke kumu i hahai ʻole ai nā hōkūhele i nā orbit Keplerian kūpono. ʻO ka mana umekaumaha o nā hōkūhele ʻē aʻe ke kumu e neʻe mua ai nā kikowaena a me nā orbit e oscillate i ka nui a me ke ʻano.
ʻO kekahi o nā hiʻohiʻona kaulana loa o kēia hanana, ʻo ia ka hoʻopilikia ʻana o Neptune ma ke kaʻapuni o Uranus. Ma mua o ka ʻike ʻia ʻana o Neptune i ka makahiki 1846, ua ʻike nā mea kilo hōkū ua haʻalele ʻo Uranus mai kona ala i wānana ʻia, e alakaʻi ana iā lākou e kuhiakau i ke alo o kahi mea nui i ʻike ʻole ʻia. Ua hōʻike kēia wānana holomua i ka mana koʻikoʻi o nā hoʻopilikia umekaumaha i nā mechanics lani.
ʻO ke kani ʻana a me nā mana kai
Hōʻike pū ʻia ka hoihoi umekaumaha i nā resonances orbital a me nā ikaika tidal, e hoʻohui ana i nā papa hou aʻe i nā dinamika paʻakikī ma waena o nā hōkūhele. Hana ʻia ka resonance orbital i ka wā e hoʻokau ai nā kino ʻelua e hoʻopuni ana i kahi mana umekaumaha maʻamau a manawa kekahi i kekahi. ʻO kahi laʻana kupaianaha ka resonance 2:3 o Neptune lāua ʻo Pluto, kahi no kēlā me kēia ʻelua orbits o Neptune, hoʻopau ʻo Pluto i ʻekolu orbits. Hoʻopaʻa kēlā mau resonances i nā orbits i nā wā lōʻihi, e pale ana i nā hālāwai kokoke a me nā collisions hiki.
Kū mai nā mana kai mai ka gradient umekaumaha—ʻo ia ka ʻokoʻa o ka mana umekaumaha ma luna o nā ana o kahi mea. ʻO kēia mau mana ke kuleana no ka laka kai, kahi e kūlike ai ka wā orbital o kekahi kino me kona wā rotational, e hōʻike ana i ka helehelena like i kekahi kino ʻē aʻe. ʻO ka hoʻohuli synchronous o nā mahina he nui, me ko mākou mahina ponoʻī, he hopena pololei ia o nā pilina kai.
I nā hihia koʻikoʻi, hiki i nā mana kai ke ikaika loa a hiki ke hoʻopilikia i nā kino honua. No ka laʻana, ʻo ke kahua umekaumaha nui o Jupiter e hoʻopilikia i kona mahina ʻo Io i ke kai e kūlou ana, e hoʻomehana ana i kona loko a hoʻokele i ka hana pele nui.
Nā Kōkua Gravitasi Interplanetary
Ma kahi pae hana, ua hoʻohana ʻia ka huki ʻumekaumaha ma waena o nā hōkūhele no ka huakaʻi lewa ma waena o nā hōkūhele. Hoʻohana nā kōkua umekaumaha a i ʻole nā slingshots i ka neʻe pili a me ka umekaumaha o nā hōkūhele e hoʻololi i ke ala a me ka wikiwiki o kahi mokulele me ka ʻole o ka hoʻolilo ʻana i ka wahie hou aku. Ma ka hoʻolālā pono ʻana i ke ala o ka mokulele, hiki i nā mea hoʻolālā misionari ke hoʻonui i kona wikiwiki, e hiki ai i nā misionari ʻimi ke hiki i nā wahi mamao me ka ʻoi aku ka maikaʻi. ʻO nā misionari Voyager nā hiʻohiʻona koʻikoʻi o kēia ʻano hana, ua kipa kūleʻa iā Jupiter, Saturn, Uranus, a me Neptune ma ka hoʻohana ʻana i nā kōkua umekaumaha.
Nā Paʻa ʻole o ka Umekaumaha a me ka Chaos
ʻOiai hiki i nā mana umekaumaha ke alakaʻi i nā resonances kūlike, hiki iā lākou ke hopena i ka hana chaotic. Ma luna o nā manawa lōʻihi, hiki i ka pilina umekaumaha ma waena o nā hōkūhele ke alakaʻi i ka paʻa ʻole a me nā orbits hiki ʻole ke wānana ʻia. ʻO ka ʻōnaehana lā, ʻoiai ke kūpaʻa nui nei, he mau mea chaotic maalea. Hiki i nā haunaele liʻiliʻi ke hōʻiliʻili ma luna o nā miliona o nā makahiki, e alakaʻi ana i nā loli koʻikoʻi i nā hoʻonohonoho orbital.
ʻO ke aʻo ʻana i kēia mau paʻa ʻole o ka umekaumaha e kōkua i nā mea kilo hōkū e hoʻomaopopo i nā loli e hiki mai ana i nā orbits honua. No ka laʻana, hōʻike nā simulations e hiki ke lilo ka orbit o Mercury i eccentric loa i loko o kekahi mau piliona makahiki ma muli o nā haunaele umekaumaha, e alakaʻi paha i kona kipaku ʻia ʻana mai ka ʻōnaehana lā.
Ma ʻō aku o ka ʻōnaehana lā
ʻAʻole i kaupalena ʻia ka huki ʻumekaumaha ma waena o nā hōkūhele i kā mākou ʻōnaehana lā. Hoʻopili nā exoplanets e kaapuni ana i nā hōkū mamao i nā pilina umekaumaha like, e hōʻike ana i ka ʻike e pili ana i ko lākou mau nuipa a me nā waiwai orbital. ʻIke nā ʻano loli manawa transit (TTV) a me nā ʻano wikiwiki radial i nā exoplanets ma ka nānā ʻana i nā hopena umekaumaha a lākou e hoʻokau ai kekahi i kekahi a i ʻole ko lākou mau hōkū kikowaena.
ʻO ka ʻike ʻia ʻana o nā ʻōnaehana multi-planeta, ʻo kekahi me nā orbits i hoʻopaʻa paʻa ʻia, e hoʻokūkū ana i ko mākou ʻike i ka hoʻokumu ʻana o ka honua a me ka ulu ʻana. Hoʻopili ka pilina umekaumaha i loko o kēia mau ʻōnaehana i kā lākou mau hoʻolālā orbital, e hoʻohālike ana i ko lākou kūpaʻa lōʻihi a me ka hiki ke noho ʻia.
Panina
ʻOiai he manaʻo maʻalahi ka huki ʻana o ka umekaumaha ma waena o nā hōkūhele, ke hoʻomalu nei i ka ballet paʻakikī o nā kino lani. Mai ka mālama ʻana i ke kūpaʻa o nā orbits planetary a hiki i ka hiki ʻana i nā misionari interplanetary a me ka hōʻike ʻana i nā mea huna o nā honua mamao, ʻo kēia ikaika kumu ke kihi o ka astrophysics. I loko o ka tapestry cosmic nui, ulana ka umekaumaha i nā kaula, e hoʻopaʻa pū ana i nā mea he nui e hoʻokumu ana i ko kākou ao holoʻokoʻa. I ko mākou hoʻomau ʻana i ka ʻimi a me ka hoʻomaopopo ʻana i nā pilina umekaumaha, ʻike mākou i nā ʻoiaʻiʻo hohonu e pili ana i ke ʻano o ka lewa, ka manawa, a me ke ʻano o ka ʻoiaʻiʻo ponoʻī.
