system
Given the following post, respond as if you're commenting on Reddit:
human
Did the impact from the asteroid that killed the dinosaurs change the earth’s orbit?

If so, how much of a change did it make?
gpt
Technically every speck of dust does, but it's negligible in both cases. An impactor with 1/1000 the diameter of Earth has (very roughly) 1/1000^3 or one billionth of its mass. If it approaches Earth at e.g. 10 km/s then it will change its orbital velocity by around one billionth of that speed, 10 micrometer/s. Compare that to Earth's orbital velocity of 30 km/s. You might change the average Earth/Sun distance of 150,000,000,000 meters by something like 50 meters, which is measurable with current tools - but it doesn't matter beyond that.