The Solar System Reading Comprehension - Softschools The Solar System. The solar system is the Sun and the objects that travel around it. The Earth is part of the solar system because it also travels around the sun. The Sun is a star similar to the other stars in the sky but it is much closer to the Earth. The Sun is mostly a big ball of gases composed mainly of hydrogen and helium. The Inner Solar System Worksheets - Printable Worksheets Some of the worksheets displayed are Name the inner solar system, Name the solar system, The outer solar system, The solar system, Teaching activity guide meet the planets, Astronomy they are very large and made of a, Unit earth and space science planets stars, Lesson 13 student work.