It's two light years away, traveling at the speed of light,so ....ummmmm....ummmm... they arrived last week.
Uh oh...Doppler effect.
When the light source is moving toward the listener (v is negative), then fL is greater than fS. In the visible light spectrum, this causes a shift toward the high-frequency end of the light spectrum. For some reason, violet got the short end of the stick and such frequency shift is actually called a blue shift
Blue is not good, it means SOMETHING is moving towards us unless these guys are just photoshopping artifacts into the picture.
>>It’s two light years away, traveling at the speed of light,so ....ummmmm....ummmm... they arrived last week.<<
Reminds me of this book: http://www.amazon.com/Red-Lightning-Thunder-John-Varley/dp/0441014887/ref=pd_bxgy_b_text_b
An object traveling at virtually the speed of light strikes the earth. Since it was “virtually” the speed of light, we got a minutes warning, and that was about it.
Great book, but not as good as its predecessor, Red Thunder.