The next advance in propulsion systems may employ an external light source.
An attack on the service shows how convoluted some hacks can become.
The best of the rest from the Physics arXiv this week:
Researchers at Black Hat reveal flaws in the infrastructure designed to keep sensitive information secure.
Data mining helps security researchers spot Internet addresses linked to compromised computers.
Draper Laboratory showcases Google Lunar X-Prize project at Apollo celebration.
Vulnerabilities in core software are dealt with quickly, while other applications have to wait.
The program manager of NASA's next launch vehicle talks about its components.
Douglas Merrill, Google's former CIO, on how to make peace between workers and IT departments.
After months of awkward courtship, Microsoft and Yahoo have finally agreed on an Internet-search partnership.