Avtory i prava: V.L. Sharpton,
Institut issledovaniya Luny i
planet
Perevod: A.V. Kozyreva
Poyasnenie:
Pochemu vymerli dinozavry? Sovershenno vnezapno 65 millionov let nazad
primerno 70 procentov vseh vidov zhivotnyh prekratili svoe sushestvovanie.
V istorii eto izvestno pod nazvaniem
"sobytie K-T" - massovoe vymiranie v melovoi-tretichnyi period.
Geologi i paleontologi chasto predlagayut gipotezu, chto
prichinoi bylo
stolknovenie s Zemlei asteroida ili komety.
Pri takom
katastroficheskom yavlenii
sredi horoshih novostei budut bushuyushie pozhary, prilivnye volny, zemletryaseniya, uragannye vetry.
Plohie zhe novosti budut zaklyuchat'sya v sleduyushem:
v rezul'tate stolknoveniya proizoidet vybros v atmosferu veshestva, chto privedet k global'nym
izmeneniyam, takim kak: prodolzhitel'nye periody temnoty, ponizhennoi temperatury,
vypadaniyu kislotnyh dozhdei. I na Zemle nastupit period global'nogo vymiraniya.
V 1990 godu nashlos' udivitel'noe
podtverzhdenie etoi gipotezy. A imenno, kosmohimik Alan Hilderbrandt
ponyal sleduyushee. Na poluostrove Yukotan v Meksike pod osadochnymi porodami
obnaruzhivayutsya
struktury diametrom 180 km i vozrastom 65 millionov let.
Naibolee vydayushiesya chasti nazyvayutsya
krater Chiksulub po nazvaniyu derevushki. Etot krater obnaruzhivaetsya na kartah
gravitacionnogo i magnitnogo polei toi oblasti i izobrazhen na segodnyashnei kartinke.
I vozrast i razmery kratera soglasuyutsya s tem, chto moglo by ostat'sya ot
padeniya asteroida (skazhem, razmerom 10-20 km),
povlekshego nablyudaemye global'nye razrusheniya.
Ne zavisimo ot togo, kakovy deistvitel'nye prichiny sobytiya K-T, nam vse-taki povezlo,
poskol'ku,
kak schitaetsya, padenie takih asteroidov
proishodit
primerno raz v sto millionov let!
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NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
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Publikacii s klyuchevymi slovami:
Earth - dinosaur - K-T event - impact - crater - asteroidnaya opasnost' - asteroidy
Publikacii so slovami: Earth - dinosaur - K-T event - impact - crater - asteroidnaya opasnost' - asteroidy | |
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