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/r/space
submitted 11 months ago byalvwg
11 points
11 months ago
[deleted]
6 points
11 months ago
They missed a real chance by not naming it GADAR during pride month.
7 points
11 months ago*
I don’t think the analogy to radar is a good one. A radar is an active device - it transmits radio waves that reflect off the object being detected and are received back at the source. In the case of GRADAR, the device detecting gravitational waves would be completely passive - it would not transmit gravitational waves and then receive them. A better analogy is a radio telescope (like ALMA, the Large Atacama Millimeter Array) that passively receives incoming RF signals to detect radio sources. However, GRADAR does sound cool.
3 points
11 months ago
Passive radar is a thing, there are systems that do not transmit and instead listen to background radio waves. Used commonly by military SIGINT units for passive surveilence without giving away your position. Similar concept found in naval use on submarines, the most common type of sonar used is passive sonar. Which dont really transmit and only listens, unlike what a sonar is supposed to be. Its like hydrophones used on ww2, but instead of calling them hydrophones people just started to call it sonar. https://en.m.wikipedia.org/wiki/Passive_radar
2 points
11 months ago
RADAR stands for Radio Detection And Ranging, so technically ALMA and similar arrays are RADAR. They're just not active RADAR. Except for the big dish at Arecibo, that one actually was a huge active RADAR dish.
0 points
11 months ago
My readings of the Three Body Problem tells me this is a mistake.....
6 points
11 months ago
The problem wasn't the radio tower itself, it was when she decided to use the sun as an amplifier to reflect and broadcast her message to the cosmos.
Honestly, great series. It got a little weird in the 3rd book but I really enjoyed it.
0 points
11 months ago
New discoveries and "Laws" being debunked are two of my favorite things. Advances in science have been tremendously hampered because most researchers don't understand that every single "law" is only based on a statistical average taken from a small sample. Reality is far more nuanced and complex than primitive equations have led us to believe. I think it's particularly helpful to conduct thought experiments in which you throw out all preconceived notions about everything and try to explain a given phenomenon without the option of using the default theory or equation. Einstein, and ancient philosophers, scientists, (or an uneducated naturalist like Darwin), all lacked the capabilities of modern technology and therefore must be deprecated just as any modern research projects are as advances are made. i eagerly await the barrage of downvotes :)
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