Happy Halloween from NASA! Active regions on the sun combined to look something like a jack-o-lantern’s face on Oct. The image was captured by NASA's Solar Dynamics Observatory, or SDO, which watches the sun at all times from its orbit in space.
Shockwaves of Star Formation - Galaxy Galaxy has mysterious “invisible” spiral arms that only become visible when you observe its X-rays. While the spiral arms propagate like shockwaves around they create bursts of star formation with.