I honestly believe we are all getting sick of the word "copyright" but it is there for a reason: to protect the creator.
Digital graphics, photos, videos, logos, slogans are all copyright and our corporate rule is - If we didn't create it, we don't use it. But what about everyone else? Life is too stressful to try to dig through an image you want to use to try to find the copy write holder to get permissions to use an image or graphic. People used to think "If it is on the web, then it is out there for anyone to use. After many lawsuits later, they discovered they were wrong.
So today, I am offering this site/article from Adobe that talks about places with common use and even commercial royalty free use graphics and photos. You may just find what you are looking for!
And if not? You can always hire us to capture that exact look or feature you need (except astronomical figures - our drones can't get that high any more.