Recent content by bothnicum

Audio archeology on the web I wonder if there has been any progress in the field of audio archeology. One potential "recording" process candidate could be the hardening of spider silk right after extrusion. Could it be imaginable that the properties of silk threads would store the changes in...

Bystander wrote: May I kindly ask whether you consider that there is a principal fault in my phrasing or just that the effects are beyond the limits of known methods and tools.

I am conducting a mental exercise on the possibility of finding mechanism that could store audible signals in a natural way without human technology. We could call it audio archaeology. We need some progressive change process that is somehow affected by the surrounding sound waves. Let's...

To be more specific: Are there any evidence that an audible signal could modulate the process of crystallization in such a way that the signal could be read by analyzing the structure of thus formed crystal?

What are the possible effects of pressure changes of the surrounding gas during crystallization. Can such changes be detected on the resulting crystal.

Toroidal black hole as a reflecftor? Question 1: Are there any evidence of toroidal shape of a black hole? Question 2: Could such a black hole act as a reflector in the sense described above?

Cluster of black holes as a reflector? Instead of a reflecting surface, could it be possible to find such a cluster of black holes that bends light like a reflecting surface.

Nereid answered at General Astronomy & Cosmology -forum: " AFAIK, Saturn, its rings and moon Titan hold the record: http://www.aas.org/publications/baa...dps2002/109.htm http://www.news.cornell.edu/Chronic...ydrocarbon.html The distance? >1 billion km " So it takes...

Picture taking works only when you know that this is the moment and topic you want to watch later. Same is valid for video. Instead given that basically all celestial objects are reflective, among the incoming radiation there must be (very) weak signals that are reflections from the Sun or...

Thanks for excellent links So it takes 2.25 hours to get a reflection back from Titan Reflections are interesting. Reflected signal is allways a signal from the history. Radar reflection from Titan tells (among other thigs) that 2.25 hours back in the history some people were...

Thanks. See https://www.physicsforums.com/showthread.php?s=&threadid=10474 Lets continue after that.

How deep in space can current radars reach?

Yes, it is hard to find an ideal mirror in space. But let me ask the other way round: - What is the most distant object in space we can get a radar signal back?

Speculum Temporis - a partial solution? All the pictures you can see in a mirror are messages from the past. Photons must first travel from the object under survey to the mirror and back to the observer. Your do not think of that in the bathroom. But imagine that the mirror is...