More tests of hydrogen over Cardiff. Using a Google street view image this time for a wider field of view. Orientation should be correct, probably.
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Sure, though I did explain in several recent posts. This is what the sky would look like if we could see the neutral hydrogen gas of the Milky Way as well as the stars. Hydrogen emits at very specific frequencies depending on how fast it's moving towards or away from us. In the above gif, the emission in different frequencies is used to generate the red, green and blue colours, which helps to enhance the visibility of the different structures. I explain more here :
ReplyDeletehttp://astrorhysy.blogspot.cz/2013/11/damn-thats-nice-piece-of-gas.html
It's a "test" in the sense that I'm trying to work out the best way to show this.
21 cm band, if I remember my Larry Niven correctly.
ReplyDeleteYep, and in Carl Sagan's Contact they even use real astronomer-speak and call it L-band.
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