Great news. NASA has a treat for you. They have made their entire collection of images, sounds, and video available and publicly searchable online. It’s 140,000 photos and other resources available for you to see, or even download and use it any way you like. Yes, copyright-free. For those of us who blog and write, this is a gift!
Here are some samples that took my fancy. You might lose a day to this website, or even more, but it’s so worthwhile for story ideas and illustrations. Enjoy.