David Schneider built his own radio telescope out of roof flashing, an empty paint thinner can, a free software-defined radio app, USB receiver, and a length of coaxial cable. The whole project cost him less than $150 and he's already used it to detect galactic hydrogen and monitor the motion of our Milky Way galaxy's spiral arms. (With a radio telescope, you look for and measure radio-frequency radiation emitted by astronomical objects.) From IEEE Spectrum:
Point at Cygnus and you’ll receive a strong signal from the local arm of the Milky Way very near the expected 1420.4-MHz frequency. Point it toward Cassiopeia, at a higher galactic longitude, and you’ll see the hydrogen-line signal shift to 1420.5 MHz—a subtle Doppler shift indicating that the material giving off these radio waves is speeding toward us in a relative sense. With some hunting, you may be able to discern two or more distinct signals at different frequencies coming from different spiral arms of the Milky Way.
Don’t expect to hear E.T., but being able to map the Milky Way in this fashion feels strangely empowering. It’ll be $150 well spent.
For years a friend has been telling my diet was hurting my general demeanor.
A favorite kitchen chemistry (and physics) experiment of kids (and adults), Ooblek is the weird result of mixing cornstarch with water. Now, MIT engineers have developed a mathematical model that can predict and simulate how the non-Newtonian fluid switches between liquid and solid depending on the pressure applied to it. From MIT News: Aside from […]
From left: Akira Yoshino, Dr. M. Stanley Whittingham and Dr. John Goodenough (Charles Dharapak / Yoshiaki Sakamoto / Kyodo News / Binghamton University) The 2019 Nobel Prize in Chemistry has been awarded to three scientists whose work developing lithium-ion batteries made mobile phones, iPads, laptops, and electric cars possible. The three recipients are U.S. engineer […]
Still using elbow grease to clean the sinks, tubs and other grimy surfaces around your house? Save your elbows, and some time. If you’ve got a power drill, the RevoClean® 4-in-1 Drill Brush Cleaning Kit will instantly turn it into a professional scrubber that can tackle any stain on any surface. Attach the 4″ nylon […]
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There are a lot of different language apps out there because nobody learns anything the same exact way – especially not something as complex as a new language. For some people, the best way is to dive in and start talking, but that’s easier said than done if you’re not around those natives you aspire […]