📖 TEST YOURSELF 4 - Reading lớp 8
💎 TEST YOURSELF 4
Do you think our planet is the only place in the universe (1) ______ there is life? Until 1995, astronomers had not found a solar system like (2) ______. A solar system is made up of a star surrounded by planets and other objects. In 1995, astronomers (3) ______ a planet orbiting (going around) a distant star like our Sun. Since then, they have found other solar systems. Astronomers now think that there are many solar systems in the (4) ______. But they do not know whether there is life in any of these other solar systems.
Our solar system is the one we know the (5) ______ about. The Sun is at its centre. Our solar system (6) ______ everything that orbits around the Sun. Planets, moons, asteroids, comets, gas, and dust are all part of the solar system.
Our solar system lies near the edge of the Milky Way (7) ______. A galaxy is a huge collection of stars. The Milky Way is shaped like a whirlpool. All the stars in the galaxy, including our Sun, (8) ______ the centre of the Milky Way.
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There have been many great inventions in human history. One great invention is the printing press. A German named Johannes Gutenberg in the 1400s invented a press that made it easy to print books. Books became much more common after the invention of the printing press. Books helped other inventors make new things.
The invention of the steam engine around 1700 led to the Industrial Revolution. Inventors made many new machines that were powered by steam engines. They invented locomotives, steamboats, and all kinds of factory machines.
Another great invention, the internal combustion engine, led to the invention of automobiles in the late 1800s. Inventors made better and better internal combustion engines. These are the engines we use today in cars, trucks, buses, and airplanes.
The discovery of electricity led to many wonderful inventions. Many scientists studied electricity. An American inventor named Thomas A. Edison invented the electric lamp, phonograph, and other things that ran on electricity in the late 1800s.
New things are invented today faster than ever before. Inventors are making new kitchen appliances, toys, computers, video games, telephones, and all kinds of other things. The ways people invent things have changed over time. Until the 1900s, most inventors worked alone. Today, most inventions come from scientists and engineers who work in teams.