I got this 1.7MB PowerPoint file attached to an email showing a series of stunning images of the earth from space. I particularly enjoy the images showing the shadow line between day and night.
BlueBeauty 1.7 MB slide show might take a while to download.
The last slide motivates the viewer to ‘send’ this file out wide. I am not sure as to who owns the images, as only agencies like NASA or ESA could capture such images, so the intellectual property might be an issue with this PowerPoint file. If it is a NASA image then there seems not much of a problem here.
On the NASA site they state as for the guidelines to use their materials they state:
Using NASA Imagery and Linking to NASA Web Sites
Still Images, Audio Files and Video.
NASA still images, audio files and video generally are not copyrighted. You may use NASA imagery, video and audio material for educational or informational purposes, including photo collections, textbooks, public exhibits and Internet Web pages.