All terrestrial planets may have the same basic type of structure; such as a central metallic core, mostly iron, with a surrounding silicate mantle. The Moon is similar, but has a much smaller iron core. Io and Europa are also satellites that have internal structures similar to that of terrestrial planets.
Average ACT: 33. The average ACT score composite at Stanford is a 33. The 25th percentile ACT score is 31, and the 75th percentile ACT score is 34. In other words, a 31 places you below average, while a 34 will move you up to above average. There's no absolute ACT requirement at Stanford, but they really want to see at least a 31 to have a chance at being considered.
No minimum GPA requirement is set for Stanford Graduate School. However, Stanford is a highly competitive educational institution and having a high GPA will help strengthen your application. For instance, TopLawSchools.com lists the median grade point average for a Stanford Law School graduate student as 3.76 to 3.96. FindTheBest.com lists 3.6 as the mean GPA for MBA students at Stanford. You can also check with specific departments to see if they'll disclose the average GPA of admitted students.