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.
You will need exceptionally good grades to get into Stanford University. The average high school GPA of the admitted freshman class at Stanford University was 4.18 on the 4.0 scale indicating that primarily A students are accepted and ultimately attend. Given the school's very highly selective admissions, acceptance at Stanford extremely difficult and unlikely even with a 4.18 GPA..