Udus anafuk : Tameẓla gar ileqman

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== Asileɣ d temhazt ==
Anagraw anafuk d win i yemmugen s usrag n uɣelluy deg teldayt n [[Asignew acubranaxeclawan|usignew acubranaxeclawan]] acafcal send n 4,568 n imelyaṛen n iseggasen.<ref>The date is based on the oldest [[inclusion]]s found to date in [[Tagersa]]s, and is thought to be the date of the formation of the first solid material in the collapsing nebula.<br />A. Bouvier and M. Wadhwa. "The age of the solar system redefined by the oldest Pb-Pb age of a meteoritic inclusion." ''Nature Geoscience,'' in press, 2010. Doi: 10.1038/NGEO941</ref> Yerna ahat asignew-a d win izegren i waṭas n [[afawatay|ifawatayen]] akken daɣen i yezmer ad yili yettekka deg tlallit n waṭas n [[itri|yitran]].<ref name="Arizona">{{Tanagit s web|azwel=Lecture 13: The Nebular Theory of the origin of the Solar System |akala=https://atropos.as.arizona.edu/aiz/teaching/nats102/mario/solar_system.html |amahil=University of Arizona |Azemz n tuwwṭa=2006-12-27}}</ref>
 
Tamnaṭ deg wanda i d-issemti usileɣ n unagraw anafuk tettwassen s usignew n tfukt azwaran,<ref>{{Tanagit s web|azwel=The chemical composition of the pre-solar nebula |amaskar=Irvine, W. M. |Anahil=Amherst College, Massachusetts |akala=https://adsabs.harvard.edu/abs/1983coex....1....3I |Azemz n tuwwṭa =2007-02-15| akala n ufaylu = https://web.archive.org/web/20171009225858/http://adsabs.harvard.edu/abs/1983coex....1....3I | azemz n ufaylu = 9 tuber 2017 }}</ref> ass mi i d-trab tugeẓ ɣef [[imir amussay|wuntum amussay]] ayen i d-tiǧǧan ad tezzi s urured meqqren. Sin akin yemsegraw wamur ameqran n tkura deg wammas yerna tuli teẓɣelt-is (ammas-nni) anda taseddart n weẓɣal n wammas-nni tuɣal d tin yugaren taseddaṛt n weẓɣal n tseɣleyt n tagra.<ref name="Arizona"/> u yal mi ara ad yenɣes [[Asignew|usignew]], ad yernu seg tuzzya alammi i yebda yettuɣal am [[tagra tamziwgant|tagra tamtiwgant]] tamazzayt s ukdu n 200 [[Tigget tasnullant|tiggtin tisnallunin]] w ad yegri [[itrazwaran]] aẓeɣlan deg wammas.<ref>{{Cite journal|aneggar=Greaves |amezwar=Jane S. |azemz=2005-01-07 |azwel=Disks Around Stars and the Growth of Planetary Systems |aɣmis=Science |amaddad=307 | amdan=5706 |tasniwin=68–71 |doi=10.1126/science.1101979 |akala=https://www.sciencemag.org/cgi/content/full/307/5706/68 |azemz n tuwwṭa=2006-11-16 |pmid=15637266| akala n ufaylu = https://web.archive.org/web/20090506042244/http://www.sciencemag.org/cgi/content/full/307/5706/68 | azemz n ufaylu = 6 mayu 2009 }}</ref><ref>{{Tanagit s web|azemz=2000-04-05 |akala=https://www7.nationalacademies.org/ssb/detectionch3.html |azwel=Present Understanding of the Origin of Planetary Systems |anefsar=National Academy of Sciences |azemz n tuwwṭa=2007-01-19| akala n ufaylu = https://web.archive.org/web/20090803020055/http://www7.nationalacademies.org:80/ssb/detectionch3.html | azemz n ufaylu = 3 ɣuct 2009 }}</ref> Dɣa imusnawen ttɣilen d akken tafukt deg tallit-a tella d [[itri T tauri]]. Tizrawin ɣef yitran T tauri mmalent-d d akken-iten teddun-d yakk d tagra n tnegwa n umtiweg azwaran s tkura imalen gar n 0.001 ɣer 0.1 seg [[takura tanafukt|tkura tanafukt]], anecta yesskanay-d d akken tuget seg tkura n usignew teqqim deg yitri-nni yakan.<ref name="Kitamara">{{Aseɣwen asarag| author=M. Momose, Y. Kitamura, S. Yokogawa, R. Kawabe, M. Tamura, S. Ida | title=Investigation of the Physical Properties of Protoplanetary Disks around T Tauri Stars by a High-resolution Imaging Survey at lambda = 2 mm | booktitle=The Proceedings of the IAU 8th Asian-Pacific Regional Meeting, Volume I | year=2003 | publisher=Astronomical Society of the Pacific Conference Series | volume=289 | editor=Ikeuchi, S., Hearnshaw, J. and Hanawa, T. (eds.) | pages=85 | url=http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?2003ASPC..289...85M&amp;data_type=PDF_HIGH&amp;whole_paper=YES&amp;type=PRINTER&amp;filetype=.pdf | format=PDF| akala n ufaylu = https://web.archive.org/web/20170901020758/http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?2003ASPC..289...85M&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf | azemz n ufaylu = 1 ctember 2017 }}</ref> sin akin nnulfan-d yimtiwgen seg unerni n tagra ayyi <ref>{{Cite journal| doi= 10.1086/429160 | azwel= Chondrule-forming Shock Fronts in the Solar Nebula: A Possible Unified Scenario for Planet and Chondrite Formation | aseggas= 2005 | amaskar= Boss, A. P. | Aɣmis= The Astrophysical Journal | amaddad= 621 | tasniwin= L137 | aneggar2= Durisen | amezwar2= R. H.}}</ref>
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