astronomer - The first person to use the telescope is an __________, Galileo Galilei., extinction - The __________ of dinosaurs happened about 65 million years ago., believed - Scientists __________ that an asteroid might have caused the dinosaurs to become extinct.__________, whether - Many people are still debating __________ Pluto is a planet or a dwarf planet., ancient - I wonder how did the __________ people learn about the planets without a telescope., curiosity - Tom’s __________ about the Solar System drives him find out more from the Internet., predict - Nowadays, scientists can __________ quite accurately when the next eclipse would occur., observations - With the inventions of powerful telescopes and robotic spacecraft, scientists are ablet to make better __________ about the Universe., vital role - NASA plays a __________ in the explorations of the Outer Space., confirmed - Earth is the only place the universe __________ to host life.,

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