5 ms·

Yes, drop a large enough rock from, say, orbital height and there might be zero carbon emissions going forward.

• progne 3y ago
  For a rock to extinguish all life on and in Earth from an orbital drop it would have to be quite large. I suppose Jupiter would be big enough.
  • mkl 3y ago
    Just human life would do, not all life. But just a drop wouldn't have the relative speed of most asteroid impacts.