Free Download — On top of offering a handy mnemonic to memorize the order of the planets in our solar system (My Very Eager Mother Just Served Us Nine Pizzas), this dataset has the mass, density, diameter, distance from the sun (in meters and AU), orbital period in earth days, eccentricity, degree of inclined angle, gravity in g’s, escape velocity, and number of satellites of each ...
Offsite — Find and compare astrogeology locations by type, diameter, the planet they’re found on, and name ethnicity. Data from the USGS Astrogeology Science Center.
Offsite — Find and compare planets in the solar system based on distance from the sun, mass, temperature and other data. Data from NASA.