I love the Earth Observatory site from NASA. I subscribed to it, and I get links to new images from the Earth Observatory once a week. You could just look on the site from time to time to get the best of it. Here’s my favorite from today (and the catalyst for sharing this information with you). You can see the “airglow” in our atmosphere! It’s beyond imagination (because its real!). The picture is linked to the Earth Observatory site. If you want more- just click on it!