Submitted by phoinex711 t3_z9zv33 in askscience
mfb- t1_iyps9oj wrote
Reply to comment by serdasus101 in Did the impact from the asteroid that killed the dinosaurs change the earth’s orbit? by phoinex711
A Mars-sized object (~10% the mass of Earth) can change the orbit significantly. It depends on the collision process.
500 km objects will have a pretty small effect.
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