Back to Article List From the July 2008 issue What is the difference between comets and asteroids? Carole Meshaw, Watha, North Carolina By Astronomy Staff | Published: July 28, 2008 | Last updated on May 18, 2023 Key Takeaways: Asteroids and comets are rocky or icy solar-system objects ranging in size from less than half a mile to many hundreds of miles wide.
