This article would be a great close read to satisfy your principals Reading in the Content request. Your reading coach will be impressed when they see this Lexiled (1120L, ~1400 words) article written to meet the grade band text complexity requirements for Common Core. If you are really sneaky, your ELA team may use this in the language arts block and support science. How's that for integration. :)
The articles covers both the hierarchical relationship between solar systems, galaxies and the universe, as well as theories about their formation.