Nasa Open Datasets
Also check out <a href="https://data.nasa.gov/data?category=&search=&type=datasets" rel="nofollow">https://data.nasa.gov/data?category=&search=&type=datasets</a> (linked to from open.nasa.gov) which all have consistent APIs -- so you can write code once and re-use it as opposed to having to write a new API wrapper for each disparate data set<p>Disclosure: I work for the company that helps run data.nasa.gov