Great Lakes, No Clouds, photo by NASA Goddard Photo and Video.

Today is Earth Day (and also Good Friday). You can read all about Michigan’s role in Earth Day on Michigan in Pictures and check the list of Earth Day events in Michigan from earthday.org.

I thought this shot from the NASA Goddard Space Flight Center was a perfect image, and it’s a great lead-in to their Earth Day 2011 slideshow, which looks at almost 40 years of Landsat images. NASA says:

Launched in 1972, the Landsat program is the longest continuous global record of the Earth’s surface. It continues to deliver both visually stunning and scientifically valuable images of our changing planet, allowing us to plan for the future of Earth’s precious resources.

Check this out big as Michigan an in their Explored! slideshow.