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Space Systems Readers and Passages

Understanding the Inner Planets - reading educational content
Understanding the Inner Planets
The inner planets of the solar system—Mercury, Venus, Earth, and Mars—are known for their solid, rocky surfaces. Mercury...
RI.4.4RI.4.2
Twinkling Stars and Galaxies - reading educational content
Twinkling Stars and Galaxies
Learn about stars, the massive balls of gas that produce light and heat, and their life cycles, from birth in nebulas to...
RI.4.4RI.4.2
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