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This is an activity about comet composition. Learners will explore the physical characteristics of comets by reaching into a series of boxes and feeling the materials and structures within. They will describe what they observe and speculate on comet... (View More) characteristics being modeled in each box, opening the discussion about the nature of these icy bodies and begin to compare them to other members of our solar system. (View Less)
This article describes the work being done by scientists to determine the origin of water found in Earth's oceans. A supplemental exploration of the Herschel Space Observatory is included. The article is targeted to children ages 10-12.