Sorry I don't know how to post pictures and I just saw the requests for them. wait until you see the picture moving like on youtube it's really cool to look at.
The toolbar above the box where you type your post, the third icon from the left, thats the option to insert an image, either from computer or directly from a link. IF you going for the URL, best to have the checkbox ticked as its bad form and not the done thing to post images via an external website. I know people who change the image to porn if they find someone is linking direct.
The animated gif of it spinning is too large, but here is the video from the NASA link I provided which someone has uploaded to youtube
[video=youtube;87kSL9uuLHQ]https://www.youtube.com/watch?v=87kSL9uuLHQ[/video]