Chapter 8 - Planets, Moons, and Stars




Unit D - Weather and Space

  • Chapter 8 - Planets, Moons, and Stars

What objects move through space, and how do they move?

Mars: Past, Present, Future

Young Naturalist Awards Essay

Mars: Past, Present, Future

In the early 1900s, some astronomers believed that the color contrasts on Mars' surface were great oceans. Today we know they are huge dust storms. Track how our knowledge of Mars has changed with this seventh-grader.

The 3-D Universe


The 3-D Universe

A 2-D map is a great guide here on Earth—and virtually worthless for finding your way around in outer space. Take a 3-D look at mapping our solar system and universe.