I've created a skill for Alexa that provides random facts about astronomical objects. It's called "Space Stuff".
To invoke this skill, just wake up Alexa and say "open Space Stuff". Alexa should then tell you a random fact. If you use the Alexa app or you use a device with a screen, you should get a space photo, too. Let me know what you think!
I've tested it with the Alexa app (which is available for Android and Apple devices), some Echo devices, and a Fire TV. Please let me know by commenting below if you have any issues with your device.
