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.
I’m not an engineer, but I can’t stop watching this hypnotic and oddly satisfying video of tying rebar.
The Australian Acoustic Observatory project, described by its creators as a kind of “Google Street View of sound,” is a new acoustic sensor network of hundreds of microphones and digital audio recorders distributed across multiple remote ecosystems on the continent. The solar-powered system will record animal and natural sounds continuously for 5 years. According to […]
Is your brain a machine? Are your thoughts and feelings just malware of the mind? (And what “really” is a machine, anyway?) John and Eva referee the transhumanist fight of the century. In the blue corner, we have Eva meeting founder and Bryan Johnson, CEO of Kernel, straight from his office in LA. And in […]
Cheap massage chairs are a common Christmas gift, but we’re willing to bet they don’t get a lot of actual use from the people who could really use a massage. We’re talking about people with deep, chronic joint pain or anyone who does a serious workout on a regular basis. For that kind of soreness, […]
The bummers of adulthood are too many to count, but one of our least favorites is the inability to sit down and enjoy a nice bowl of cereal. When you’ve got a long commute ahead, let’s face it: That extra time it takes to pour the milk and chow down is too precious to spare. […]
Who are these people that have time for a job, social life, and actual healthy meals? With a nutrition segment on seemingly every talk show and entire networks devoted to food, it can sometimes seem like we’ve never left our mother’s house and her constant admonitions to “eat your vegetables!” And okay, she was right. […]