Starship Asterisk*

In the explanation for the August 26 APOD, the false-color green ring is estimated to be 10 light-years in diameter. Also, it states that light from the explosion first reached Earth just over 300 years ago. If the green ring represents the wavefront from the explosion, it must be moving very quickl...

I'm sorry I didn't read this topic before starting "Backward Brain?". I see the reverse image consistently regardless of the direction of illumination. It happens most often when the light is low angle which is preferred because it highlights the relief. I've never met anyone with the same...

Whenever I first look at a high quality photo of a cratered surface, or actually any photo of a surface with high relief and a low angle for the illumination (such as http://antwrp.gsfc.nasa.gov/apod/ap020627.html), my brain initially processes the image in reverse. That means that craters look like...