color

AuroraFlag_Stalnacke_960

I guess I always remember that usually talk about the aurora, but never speak to you color them. Quickly, auroras are caused by the Earth’s magnetic field (in our case) […]

sunspectrum_noao_960

It is time to put something a little more “physical” about the boobs I usually count every day and that is, the image you see may be called “all the […]