You are probably thinking of Louis Slotin. On 21 May 1946 at Los Alamos Laboratory, Slotin was demonstrating a criticality experiment using a plutonium core later nicknamed the “Demon Core.”…
Yes, 93,000 counts per minute (CPM) is a fairly strong reading for a Geiger test source, although how “large” it is depends on the detector and the source geometry. For…
I asked ChatGPT to explain following to me: From https://newatlas.com/telecommunications/flat-rooftop-satellite-antennas/ “Ground Control to Major Tom,” the evergreen lyrics to David Bowie’s 70s hit, Space Oddity. What’s odd is that, despite…
Yes. There are several free options that will transcribe your speech into text as you dictate: Smartphones Windows PCs Linux For long interviews or lectures My recommendation Since you use…
Jason has calculated gain based on my plot below: I’m getting about 0.73 dB above background for that trace so pretty consistent with your previous results. Looks good! Jason Burnfield
At the 1420.405 MHz hydrogen line, the SETI Horn of Plenty is generally quoted at about +20 dBi gain (roughly +18 dBd). For comparison: Antenna Approx Gain (dBi) Approx Gain…
The commonly quoted lambda/4 criterion is not really a limit on the flare angle itself; it is a limit on the resulting path-length or surface-position error caused by a construction…
Yes. On Ubuntu you can disable automatic updates completely, or just stop the update notifications while still updating manually when you choose. Temporary: stop automatic updates Open a terminal and…
https://www.astronomy.me.uk/wp-content/uploads/2026/05/SETI_Horn_Flare_Angle_Calculations-1.docx Using the usual amateur SETI “Horn of Plenty” dimensions: the flare half-angle is: alpha = arctan((A – a)/(2L)) Substituting: alpha = arctan((0.91 – 0.165)/(2 x 1.22)) alpha = arctan(0.3053)…
Using medium-format lenses on a full-frame A-mount body like the Sony Alpha A99 is a niche but very enjoyable setup if you like manual focus, unusual rendering, and superb central…
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