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.
So for example getting a 150 on both verbal and quant sections of the GRE will most likely not make any impression on the admissions committee at Stanford. The average GRE scores for Engineering department at Stanford is 167 on quant, 161 on verbal and a 4.5 on the analytical writing section. Most of these top schools do not state the minimum or average GRE scores that they are looking for in an applicant.