[LMB] OT: Arecibo

[Markus Baur]

Am 22.11.2020 um 21:20 schrieb Howard Brazee:
On Nov 22, 2020, at 1:00 PM, Luke Bretscher <rocketman0739 at gmail.com> 
wrote:
>>>> Oh.  I had been under the impression that OPTICAL telescopes
>>>> were somehow better at picking out dead ice and rocks in
>>>> local environments, while RADIO-telescopes like Arecibo were
>>>> more stellar ... so to speak.
>>> Arecibo actually uses radar.
>> Radar as opposed to radio? I'm not sure what distinction you're drawing.
> Normal radio telescopes just listen.   Radar  is when signals come from Arecibo and bounce off of whatever it is looking at, and come back.

which is why it is useful only for short range targets like asteroids or 
planets

servus

markus