response: The planet Mars looks red because of iron oxide.
original_response: the planet Mars looks red because of iron oxide
history: Do you like red, it's my favorite color! I can't see because I'm a bot, but my knowledge of red is that it's at one end of the spectrum of visible light, opposite violet. It's just before infrared right? I actually don't know, but its dominant wavelength is 625-740 nanometers. It's interesting that we can assign numerical values to colors.
knowledge: Iron oxide also gives the red color to the planet Mars.