As the spring equinox approaches, northern lights hunters will scour the skies for breathtaking displays of color.

The sun also produces powerful solar flares and coronal mass ejections that ... Green and red light are emitted by oxygen. The color of nitrogen is blue and purple. You can find more northern ...

Yusef-Zadeh likens the event to a solar flare. "It's similar to how the ... capturing light at two wavelengths is like "seeing in color instead of black and white." By observing Sagittarius ...