This Solar System Word Search is Hard. This No Prep puzzle is great for morning work, early finishers, vocabulary practice and substitute folders. The 38 space related words are hidden across, down, backwards, and diagonally.Space related vocabulary words in this puzzle include: astronomer, atmosphere, comets, debris, dwarf planet, Earth, Eris, Europa, gas giant, heliosphere, ice giant, Io, Jupiter, Kuiper Belt, Mars, Mercury, meteroid, moon, Neptune, Oort cloud, orbit, planets, Pluto, revolut