Laser emits multi-wavelength light
Semiconductor lasers are usually monocromatic because the electrons stored in energy bands do not emit any photons unless they move out of the semiconductor’s conduction band. Federico Capasso a...
Wet weather on Titan
Planetary physicists hope to use atmospheric data from Titan to provide clues to the behaviour of our own atmosphere. The difficulty with studying Earth’s atmosphere is that it is affected by ex...
India and Pakistan lied about nuclear tests
These latest results, according to Barker et al., indicate “high confidence” that the network being set up to monitor the CTBT can indeed verify small nuclear explosions. Concerns over the...
Physics fights terrorism
Bill Richardson, head of the DOE, says that Livermore “will provide critical new technologies to counter the threat of weapons of mass destruction [and provide] the FBI with new capabilities tha...
Quasar images confirm potential of virtual telescopes
HALCA was launched by Japanese astronomers in 1997 to detect radio signals at wavelengths that that are difficult to detect from the ground. In addition to conducting their own observations, the HALCA...
Seeing light over contaminated soil
The device works by utilizing a small hydraulic ram attached on the back of a truck. When the vehicle is parked in the sample area, the ram fires a metal rod 30 m into the soil. At the top of the rod,...
Still moving images
When we walk across a room, our eyes automatically adjust to keep objects in focus. The eyeballs swivel in their sockets to compensate for the movement. Professional camera operators use a harness con...
Testing the water
The detection and monitoring of metals and organic compounds in water, is normally done by having an technician collect on-site field samples. These samples are then take back to a laboratory. Though ...
