It might seem like a simple question. But the science behind a blue sky isn't that easy. For starters, it involves something ...

NASA's Hubble Space Telescope has captured a 'boom' in deep space, estimated to be at least 600 million light years away from ...

Though the storm appears red to the human eye, in this ultraviolet image it appears darker because high altitude haze particles absorb light at these wavelengths. The reddish, wavy polar hazes are ...