Asteroids have been of continued interest and research among scientists and the general public. This issue's Topic in Depth explores some of the Internet's offerings on the subject. From Spaceflight Now, the first site (1) is an April 7, 2002 article that describes new research, showing that "there are between 1.1 million and 1.9 million 'space rocks' larger than 1 kilometre in diameter in the...

NeoDys, a project developed at the University of Pisa in Italy, supplies data and services for all Near Earth Asteroids. Updated daily, researchers can find links to all NeoDys objects and observatories as well as data on Earth Impact Possibilities. Educators and students will find instructive explanations of Near-Earth Asteroids and three dimensional visualizations of the objects' orbits....