| A scientist investigating space observes many things. You use your senses too to find out about other objects, events, or living things. |
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| Scientists use process skills when they investigate places or events. You will use these skills when you do the activities in this book. Which process skills might scientists use when they explore space? |
| scientists classify objects in space according to their properties. when you classify, you arrange or sort objects, events or living things. |
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| As they build satellites and other machines, scientists first estimate the sizes of the various parts, and then they measure each part. |
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