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madman
2013-Feb-27, 07:28 AM
multiwavelength understanding of large and complex structures inside (and beyond) the galaxy is still in the early stages of its discovery phase.


some structures inside the galaxy have a very large angular size.

an example is Loop 1 which appears to be around 90dg in size.

http://cosmoquest.org/forum/album.php?albumid=345

using a multiwavelength compositing method it can (arguably) be seen that materials such as galactic dust, hydrogen clouds and xray emitting superbubbles all vie for space in what amounts to a pressure system inside the galaxy.

http://cosmoquest.org/forum/album.php?albumid=343

with the discovery of helical forms wrapped around filaments we begin to see complex forms that have components that are only visible in distinct wavelengths. in this case: infrared (the filament) and radio (the helix).

quite probably other complex multi-component objects are still to be detected (in various wavelengths) and so the field is open to discovery.

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neilzero
2013-Feb-27, 02:10 PM
Long ago I read a article which calculated various wave lengths that would be produced by star ships traveling up to 99.99999 c and various sizes and types of propulsion. Some of the wave lengths were as long as the FM broadcast band = about 3 meters. We need radio telescopes with dimenions in kilometers to get as good sensitivity as we get at millimeter waves. I suspect sensitivity is lower for far infarred, far ultraviolet, Xrays and gamma, but I have seen no numbers in nanowatts per meter, which is usual for radio waves. Visable light may be our most sensitive part of the EM spectrum. I know this is not the info you want, but I hope it will inspire posts closer to your needs. Neil