Originally published on Thu October 4, 2012 1:43 pm
You are 200 miles directly above the Martian surface — looking down. This image was taken by the Mars Reconnaissance Orbiter on Jan. 27, 2010. (The color was added later.) What do we see? Well, sand, mostly. As you scroll down, there's a ridge crossing through the image, then a plain, then dunes, but keep looking. You will notice, when you get to the dunes, there are little black flecks dotting the ridges, mostly on the sunny side, like sunbathing spiders sitting in rows. Can you see them?
Originally published on Thu October 4, 2012 6:53 am
A sunny day at the beach has plusses and minuses for your health.
A little bit of sun can help your body produce vitamin D, but the sun's ultraviolet radiation raises your risk for skin cancer. And, it turns out, UV radiation poses another threat — it physically weakens your skin.