SPACE AND EARTH

SPACE AND EARTH

1. Big bang theory

   • says the universe
     • had been formed 13.7 million years ago

2. had been discovered

   • to Neptune in 1846

3. The first artificial satellite

   • had been launched
     • by the Soviet Union in 1957

4. The solar energy

   • is popularized in 1970s

5. it had launched

   • the best robot called curiosity in 2012

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