ADMICRO

Choose the best answer:
Planet earth is part of a system of planets and their moons, as well as numerous asteroids and comets which (26)_________around a huge star we call the Sun. The Sun itself (27)_________of gas. Nuclear reactions inside its core (28)_______the heat and light that make life on the Earth (29)________. The Earth is the third of four small terrestrial (Earth like) planets that orbit close to the (30)_________. Further out in our Solar System are four huge gas planets, while distant Pluto, (31)_________planet, is made (32)_________rock and ice. Our Earth is one of the ten planets that orbit the Sun- a huge, burning-hot star in the center of our Solar System. The Solar System and all the stars in the (33)_________are part of our galaxy-the Milky Way, which (34)________as many as 200 billions stars. Beyond our galaxy (35)_________millions more galaxies. They all add together to make up the Universe

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