How I Use It
My wife and I use this app with our 5 year old son to teach him more about the Earth and the other planets in the Solar System. There are specific sections of the app that let users learn more detailed specifics about the Earth (day and night, seasons, etc), the Moon, the Sun, and other celestial bodies. However, my (and my son's) favorite feature is the ability to compare planets and their sizes. You can put any two planets and/or the Sun next to each other to see how their sizes compare. This feature really helps students get a better perspective and idea of how big the planets are in relation to each other.
There is a lot of text-based information, so although the age range is for students in grades 1-8, older students who are stronger readers will get more out of the app. This is a great tool for curious students to learn more about the Solar System. Also, a middle school science or Earth science teacher could ask their students to research certain planets or celestial bodies using this app.
This is a pretty solid app. The visuals are very nice (viewed on a Samsung Galaxy Tab Pro 8.4 tablet). Text-to-speech, or an audio component would make some of the information more accessible to younger learners, but that would also increase the size of the app installation file. Overall, I would still recommend this app.