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Homework Helper Expl. 1 | Expl. 2 | Expl. 3 | Expl. 4 | Expl. 5 | Expl.6 | Great Books! Exploration 4 Homework Helper. How Have Satellites Changed Since Sputnik? Communications satellites ( link 1 | link 2) Weather satellites ( link 1 | link 2 | link 3) Navigation satellites ( link 1 | link 2 | link 3) Reconnaisance satellites ( link 1 | link 2) Environmental satellites ( link 1 | link 2) How do satellites stay in orbit ( link 1 | link 2 | link 3) Anti-satellite weapons ( link 1 | link 2 | link 3)