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foma_kyniaev t1_itq62j0 wrote

Define planet killer asteroid. Was 15 km big Chicxulub impactor a planet killer? Is the 400m big Apophis?

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Bensemus t1_itrax6f wrote

Planet killer is one that threatens life on the planet. Earth wasn't destroyed by Mars sized impact so no asteroid is actually threatening the structure of the planet.

15km is pushing humans towards extinction but not guaranteed, billions would die. 400m would be a natural disaster that could kill millions or more, depending on where it hit.

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khorijinn t1_iuihujb wrote

A 15 km asteroid hit would be a planet savior, in that it would wipe out most or all of it's human infestation and give it time to recover from our damage.

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