An object this size could cause significant tidal waves were it to strike an ocean, potentially devastating even distant shores. A collision with a massive asteroid , over 1 km across, is more rare , occurring typically millions of years apart, but could have truly global consequences . Many asteroids remain undiscovered. Such an interplanetary collision would not affect Earth's orbit so much as raise dust that would affect Earth's climate . One likely result is a global extinction of many species of life, possibly dwarfing the ongoing extinction occurring now .
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