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The Basics Life on Earth
Wondering and Thinking
Life in the Solar System? The Facts As We Know Them
2 other sections not shown
200 billion stars Advance two squares ammonia Ancient Astronauts Antarctic Antarctica artist imagines artist's concept Asimov Gareth Stevens atoms bacteria bacterium become extraterrestrials building blocks canals built carbon dioxide cells chemicals clouds comets complex molecules detect oxygen develop distant planet distant solar system dust and gas early atmosphere Earth orbit Earth-like planet Earth's atmosphere Extraterrestrial Intelligence forms exist Galaxy gas in Earth's gases hoax hydrogen icy surface Inset interstellar invade Earth Jupiter Jupiter's Kennedy Space Center known planet landed on Mars leaves Earth light-years live look Martian messages methane Moon move water NASA nearest star Neptune's Ontario planetary planets orbiting player probes radio telescope Raintree Reaching the stars satellites Science Centre science fiction scientists Search for Extraterrestrial Set your course SETI ship Simple life forms spores star Beta Pictoris starship strange sulfuric acid trying to detect Unidentified Flying Objects uninhabited Venus Voyager worlds