Science

Photonic laser thruster could power spacecraft from Earth By David Hambling Artist’s impression of satellites flying in low Earth orbit, powered by Photonic Laser Thruster technologyY.K. Bae Corporation A new laser thruster could be a step towards new technology to push satellites rapidly between planets. The demonstration model of the Photonic Laser Thruster (PLT) moved a 750-gram mock satellite along a track in the laboratory using only the power of light. Laser thrusters, which exert force through light pressure, usually need extremely powerful lasers to generate tiny amounts of thrust. For instance, a different project – Breakthrough Starshot – envisages using gigawatt-scale lasers to accelerate probes the size of a … ...

Apparent Atlantic warming cycle likely an artifact of climate forcingVolcanic eruptions, not natural variability, were the cause of an apparent "Atlantic Multidecadal Oscillation," a purported cycle of warming thought to have occurred on a timescale of 40 to 60 years during the pre-industrial era, according to a team of climate scientists who looked at a large array of climate modeling experiments. The result complements the team's previous finding that what had looked like an "AMO" occurring during the period since industrialization is instead the result of a competition between steady human-caused warming from greenhouse gases and cooling from more time-variable industrial sulphur pollution. "It is somewhat ironic, I suppose," said Michael E. Mann, distinguished professor of atmospheric ...

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The Physics of Windmill Design This video was created in partnership with Bill Gates, inspired by his new book “How to Avoid a Climate Disaster.” Find out more here: https://gatesnot.es/3u7UUVU This video is about how physics dictates the design of modern windmills - why they are so big, have so few blades, and have such skinny blades. REFERENCES H. Glauert: Aerodynamic Theory, 1935 Division L (Airplane Propellers), Chapter XI: Windmills and Fans Wind power extraction fundamentals https://home.uni-leipzig.de/energy/energy-fundamentals/15.htm Betz's Law https://en.wikipedia.org/wiki/Betz%27s_law Tip Speed Ratio https://en.wikipedia.org/wiki/Tip-speed_ratio Aerodynamics of Wind Turbines Book https://www.amazon.com/Aerodynamics-Wind-Turbines-Physical-Analysis/dp...