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And the Hessdalen phenomenon illustrated this brilliantly, and caused some puzzlement at the same time. The spectra of colours was continuous, not discreet, which is strange because if you look at the spectra from any of our artificial light sources, apart from lasers, you get characteristic lines which are individual to that light source.
So say a sodium vapour lamp has a different spectra to a fluorescent tube etc. It is this type of science that allows us to tell which gases are present in stars etc very far away. You look at the optical characteristics of whatever light comes your way and the Hessdalen lights in one very famous photo had extremely unusual characteristics.

The glow of some solid UFOs in flight, along with interesting lights in the night sky - all these would have much to reveal just from splitting the light as Chris mentions. It really is a fundamental and very worthwhile area of physics. An awful lot can be gleaned just from light emitted.

<blockquote data-quote="Goggs Mackay" data-source="post: 234629" data-attributes="member: 4654">And the Hessdalen phenomenon illustrated this brilliantly, and caused some puzzlement at the same time. The spectra of colours was continuous, not discreet, which is strange because if you look at the spectra from any of our artificial light sources, apart from lasers, you get characteristic lines which are individual to that light source. So say a sodium vapour lamp has a different spectra to a fluorescent tube etc. It is this type of science that allows us to tell which gases are present in stars etc very far away. You look at the optical characteristics of whatever light comes your way and the Hessdalen lights in one very famous photo had extremely unusual characteristics. The glow of some solid UFOs in flight, along with interesting lights in the night sky - all these would have much to reveal just from splitting the light as Chris mentions. It really is a fundamental and very worthwhile area of physics. An awful lot can be gleaned just from light emitted.</blockquote>

[QUOTE="Goggs Mackay, post: 234629, member: 4654"] And the Hessdalen phenomenon illustrated this brilliantly, and caused some puzzlement at the same time. The spectra of colours was continuous, not discreet, which is strange because if you look at the spectra from any of our artificial light sources, apart from lasers, you get characteristic lines which are individual to that light source. So say a sodium vapour lamp has a different spectra to a fluorescent tube etc. It is this type of science that allows us to tell which gases are present in stars etc very far away. You look at the optical characteristics of whatever light comes your way and the Hessdalen lights in one very famous photo had extremely unusual characteristics. The glow of some solid UFOs in flight, along with interesting lights in the night sky - all these would have much to reveal just from splitting the light as Chris mentions. It really is a fundamental and very worthwhile area of physics. An awful lot can be gleaned just from light emitted. [/QUOTE]

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