Not every useful resource is locked behind a subscription database! Here are some web sites on planetary science that you might find helpful in your research.
Museum of Natural History
NASA Planets Overview
NASA Planetary Science Program
National Air & Space Museum
The Planetary Society
Have you ever wondered about the trustworthiness of the information you find on the internet? Given that anyone with internet access can put up information, most of what you find using Google has not undergone a review process. For these reasons, when you use Google, you need to be your own reviewer of Googled sources to ensure what you find contains factual information.
Where do you start?
Here are some basic questions you can ask yourself when assessing the reliability of websites and other information you find using Google.