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.
ACT Scores Needed to get into Stanford. A minimum ACT of 31 would put you in the lowest quartile of the SAT range historically accepted, but still offer a chance at admission. Submitting an ACT of 33 will put you in the top half and give you a better chance. If you want to be very competitve you'll need to apply with a 35.