The sun’s rays contain all the colors of the visible light spectrum: red, orange, yellow, green, blue, indigo and violet. Perhaps your elementary school teacher taught you to remember the colors ...

1820: English physician Sir Everard Home first proposes that skin pigmentation has protective effects against the sun and that a component ... They find that dark red veterinary petroleum is ...

NASA's Curiosity rover has captured "sun ... red and green light visible. Martian sunsets are moody. However, last month @MarsCuriosity captured a different kind of sunset on the planet. Rays ...