The Red Rectangle lights up

What's the Red Rectangle?  

No one knows for sure.

But now we have a better image of it.

Hubble Telescope Captures Sharpest Image Yet of Mysterious Red Rectangle

"This new image gives scientists the best understanding yet of the structure of the Red Rectangle, according to a statement from NASA. Instead of a rectangle, it appears that the nebula around the star is shaped like an "X," with ladder-like rungs of glowing gas connecting the four arms."

Here's the picture:

Compare to an older one from 2004: