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 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.
Science Ask Astro: If gravity is the weakest fundamental force, why is the Sun’s gravity so far-reaching?
Exotic Objects, Galaxies Astronomers detected two major targets with a single telescope – a mysterious signal and its source galaxy
Human Spaceflight, Science Ask Astro: How fast could a ship reach light-speed without crushing its human occupants?
