People love the rainbow of ROYGBIV colors: red, orange, yellow, green, blue, indigo and violet. Human eyes perceive visible light as this array of colors. You may notice that some colors you can ...

People from cultures across the world have been looking at Mars since ancient times. Because it appears reddish, it has often been called the red planet. Your blood is also red because of a mixture of ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) Curious Kids is a series for children of all ages. If you have a question you’d like ...

People from cultures across the world have been looking at Mars since ancient times. Because it appears reddish, it has often been called the red planet. The English name for the planet comes from the ...

Michael Kanellos is editor at large at CNET News.com, where he covers hardware, research and development, start-ups and the tech industry overseas. Your eyes evolved to see rosy cheeks. The eyes in ...

Mars isn't a bright, fire-engine red, but the iron oxide in its rocks makes it appear redder than other planets, especially from afar. When you purchase through links on our site, we may earn an ...

This article was originally published at The Conversation. The publication contributed the article to Space.com's Expert Voices: Op-Ed & Insights. People from cultures across the world have been ...