What took nearly 3 years to travel from Washington, D.C., to Galveston, Texas? Celebrate Juneteenth with a replica of Lincoln’s Emancipation Proclamation.
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Lesson Plans - 7th GradeBefore satellite technology was developed, information took longer to reach the general public. The Hubble gives us images that are thousands of years old because light travels at a finite speed across vast distances of space. It is likely that some day it will be possible for humans to colonize and sustain life on other planets, especially our neighbor Mars. |
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