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We should shine lasers into space if we want to hide our presence from aliens, two US-based astronomers suggest. The beams could compensate for the dip in light the Earth creates when it passes in front of the Sun, as viewed from far-off worlds, they contend.
Laser propulsion is a form of beam-powered propulsion where the energy source is a remote (usually ground-based) laser system and separate from the reaction mass.
The US has finished constructing a huge physics experiment aimed at recreating conditions at the heart of our Sun. The US National Ignition Facility is designed to demonstrate the feasibility of nuclear fusion, a process that could offer abundant clean energy. The lab will kick-start the reaction by focusing 192 giant laser beams on a tiny pellet of hydrogen fuel. To work, it must show that more energy can be extracted from the process...
2009-03-31
physics laser nuclear fusion energyA major hurdle to producing fusion energy using lasers has been swept aside, results in a new report show. The controlled fusion of atoms - creating conditions like those in our Sun - has long been touted as a possible revolutionary energy source. However, there have been doubts about the use of powerful lasers for fusion energy because the "plasma" they create could interrupt the fusion.
2010-01-28
laser energy physics nuclear fusion ignitionThe 50th anniversary of the first demonstration of a ruby laser at the Hughes Research Labs in the US.
2010-05-12
laser history technology science lightIt uses a laser guidance system and specially developed 25mm high explosive rounds which can be programmed to detonate over a target.
2010-11-30
USA invasion Afghanistan military weapon above laser gun killing efficiency