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Comment Re:QuDruple ypur costs (Score 1) 361

Adding a further "me too", that this statement is entirely wrong.

Both a (single cycle) aircon and heat pump us a compressor, heat exchange and Boyles law to "move" heat between outside and inside. The energy used is to drive to compressor and not directly heat or cool anything.

When I grew up single cycle aircon did cooling, heat pump did hearing.

A reverse cycle aircon can do either cooling or heating. Either way its functioning is identical to the single cycle or heat pump when used in that fashion. But as I said in a separate comment - surely ALL aircon are reverse cycle now? In Australia the have been for 20+ years.

Comment Re: I use a heat pump for my pool (Score 1) 361

I came here to say the same thing. I think (pretty much) all Aussie aircon's have been reverse cycle for closer to 30 years. I grew up in Tassie. Something like 35 years ago heat pumps were all the rage (and Tassie is hardly known for being the most advanced in the word), So that this is an discussion point really is a WTF moment. (The heat pumps 35 years ago really were that - they did not have a cooling option. These days it is all reverse cycle obviously).

Comment Re:THe question is (Score 1) 153

Funnily enough, this has been thought of before. There is a huge about of literature about what sort of human techno-signatures (TV signals, radar, beamed communication, spread spectrum etc) would be visible from how far away. The answer is surprisingly far (the more directional the transmission obviously the farther away if can be seen).

All these arm chair "experts" thinking they know whats going on better than literal astrophysicists is quite hilarious.

Comment Whats the point of 5G? (Score 1) 102

I just did a test on 4G in Australian (Sydney), and get 75 Mbps download and 20 Mbps upload. I really struggle to understand the niche 5G is trying to fill. The existing 4G is more than enough to stream HD video in realtime. What is 5G giving that is really needed (other than a new marketing term)?

Comment Re:I would Hope (Score 1) 112

They used timing of pulsars to measure gravitational radiation. It was at the time the best confirmation of general relativity (maybe still is).

The paper is https://www.nature.com/article...

My PhD supervisor was author #3, but missed out on joining the noble prize (Authors #1 and #2 got it). He took it with remarkable grace.

More recently, Arecibo discovered the first repeating radio burst.

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