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.
The massive scale and force of the ongoing bushfires in Australia is hard to comprehend.
“To the world leaders and those in power, I would like to say that you have not seen anything yet. You have not seen the last of us, we can assure you that. And that is the message that we will bring to the World Economic Forum in Davos next week.” In the Swiss city […]
This is some pretty amazing and highly rare video — seldom do you get footage of five, count ’em FIVE, California mountain lions all hanging out together. The big cats were captured on home surveillance video, in a rare gathering of the typically solitary critters.
Going to the beach is almost always an enjoyable experience, but trekking back through your house on the way to the shower can leave a trail of sand the quickly saps the day of its sunny fun. Thankfully this BeachBox: Portable Shower & Storage unit has you covered the next time you hit the beach. […]
When it comes to immediately grabbing a reader’s attention in any medium, few things are more important than picking the perfect font—regardless of whether you’re advertising your brand online or in print. The MyFonts Monotype Fresh Font Bundle offers over 50 handcrafted fonts from one of the world’s most revered typeface companies, and it’s available […]
We’re all guilty of constantly staring at a variety of screens throughout the day. The only problem is that the blue light that’s emitted by most electronics — and even energy-efficient lightbulbs — is notoriously bad for our eyes and, subsequently, our health. Here are three glasses that offer superior protection for your eyes both […]