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South African researchershave discoveredthe first evidence of a comet hitting Earth
NASAdiscoveredthe comet hurtling towards Earth
The chance of one impactlater causingthe comet to hit the Earth
by NASA scientist(passive) discovered byEarth A rare comet
Planet Xcausedcomet catastrophes on Earth
Budget for " Deep Impact " , a film about the devastation >causedwhen a comet hits earth
Budget for Deep Impact , a film about the devastationcausedwhen a comet hits the earth
a film about the devastationcausedwhen a comet hits earth
the devastationcausedwhen a comet hits earth
devastationcausedwhen a comet hits earth
devastationcausedwhen a comet hits earth
during this eclipse(passive) will be discoveredan Earth threatening comet
the automotive equivalent of mass extinctioncausedfrom a comet striking the Earth
a teenage boydiscoversa comet approaching earth
to understandcausesa comet to break
KohoutekdiscoveredComet Kohoutek
by amateur Russian astronomer Leonid Elenin(passive) discovered byComet Elenin
the Russian astronomer Leonid Elenin(passive) was discovered byComet Elenin
Russian astronomer Leonid Elenin(passive) was discovered byComet Elenin
by an amateur Russian astronomer in 2010(passive) was discovered bycomet Elenin
an amateur Russian astronomer in 2010(passive) was discovered bycomet Elenin
amateur astronomers(passive) was discovered byComet ISON
Artyom Novichonok and Vitali Nevski(passive) was discovered byComet ISON
Russian Leonid Elenin ( only(passive) was discovered byComet Elenin
by a Russian astronomer(passive) discovered byComet Elenin
the Russian astronomerdiscoveredComet Elenin
Russian astronomerdiscoveredComet Elenin
in 1948(passive) was discoveredComet Wirtanen
the Lulin Sky Survey in Taiwan(passive) was discovered byComet Lulin
on September 21 , 2012(passive) was discoveredComet ISON
by Leonid Elenin(passive) discovered bycomet Elenin
Leonid Elenin - Leonid(passive) was discovered byComet Elenin
first(passive) was ... discoveredComet ISON
by an astronomer(passive) discovered bycomet Elenin
in September 2012.(passive) was discoveredComet ISON
in September 2012(passive) was discoveredComet ISON
at Lulin Observatory in Taiwan(passive) was discoveredComet Lulin
the RussiandiscoveredComet Elenin
a Chinese teenager at the Lulin Observatory in Taiwan(passive) discovered byComet Lulin
on September 21st(passive) was discoveredComet ISON
to the demise of the dinosaurs and most of the planet 's other speciesleadingto the demise of the dinosaurs and most of the planet 's other species
tsunamis around the worldhad causedtsunamis around the world
this extinctioncausedthis extinction
that extinction(passive) was causedthat extinction
an apocalyptic eventcausingan apocalyptic event
an year droughtcausingan year drought
earthquakes and tsunamiscausingearthquakes and tsunamis
to life on Earth Crust Study of Earth?s crustmay have ledto life on Earth Crust Study of Earth?s crust
massive destructioncausingmassive destruction
to life on Earth Earthmay have ledto life on Earth Earth
to life on Earth Earth Growing mountainsmay have ledto life on Earth Earth Growing mountains
to life on Earth climate Long - term warming likely to be significantmay have ledto life on Earth climate Long - term warming likely to be significant
to life on Earth Asteroidmay have ledto life on Earth Asteroid
to life on Earth oceanmay have ledto life on Earth ocean
Australo - Asian tektites and a global disaster of about 10,000 years BP ,(passive) caused byAustralo - Asian tektites and a global disaster of about 10,000 years BP ,
a ? Great Floodcausinga ? Great Flood
to life on Earth Volcanoes Studymay have ledto life on Earth Volcanoes Study
to life on Earth Arctic Studiesmay have ledto life on Earth Arctic Studies
to life on Earth Earthquake Doubtmay have ledto life on Earth Earthquake Doubt
mass extinctions , including the demise of dinosaurscausedmass extinctions , including the demise of dinosaurs
to life on Earth mountain Geologistsmay have ledto life on Earth mountain Geologists
an earth shattering explosioncausingan earth shattering explosion
a huge earthquake described here as a ? great earthquakewould also causea huge earthquake described here as a ? great earthquake
a huge earthquake described here as a great earthquakewould ... causea huge earthquake described here as a great earthquake
the Tunguska explosion of 1908(passive) caused bythe Tunguska explosion of 1908
the Tunguska explosion of 1908(passive) caused bythe Tunguska explosion of 1908
the dinosaurs to become extinctcausedthe dinosaurs to become extinct
a mass extinction(passive) caused bya mass extinction
each time(passive) was caused byeach time
the dinosaurs to become ecausedthe dinosaurs to become e
mass - extinction events(passive) caused bymass - extinction events
mass extinctionswould causemass extinctions
the cooling(passive) was caused bythe cooling
the cooling(passive) was caused bythe cooling
a huge earthquake described here as awould also causea huge earthquake described here as a
the ice age(passive) was causedthe ice age
sudden environmental changes(passive) caused bysudden environmental changes
mass extinctionswould causemass extinctions
the Lyrid meteor shower and the resulting shooting stars seen from Earthcausesthe Lyrid meteor shower and the resulting shooting stars seen from Earth
Perseids meteor shower could crash into Earth Comet which causes Perseids meteor shower could crash into Earth Comet which causes Perseids meteor shower could crash into EarthcausesPerseids meteor shower could crash into Earth Comet which causes Perseids meteor shower could crash into Earth Comet which causes Perseids meteor shower could crash into Earth