As a special planet in the solar system, the earth mainly displays in the following aspects A is the most massive of the eight planets B has the temperature, atmosphere, water and other conditions suitable for life C has both rotation and revolution D is the smallest planet in the solar system

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• 1. How to explain that the earth is an ordinary planet in the solar system
• 2. It shows that the earth is an ordinary planet in the solar system
• 3. Why is the earth an ordinary planet in the solar system
• 4. What are the stars, planets and satellites in the solar system?
• 5. The three basic layers of the universe () a sun, earth and moon, B galaxies, stars and planets, C galaxies, stars and solar system, D earth, moon and satellites I think it should be B, but the answer is C. is the answer wrong,
• 6. The earth is the home of human existence, it belongs to () A. Stars B. planets C. satellites D. comets
• 7. What are the characteristics of the planets and stars in the solar system
• 8. The earth we live on is a relatively small planet in the solar system
• 9. Earth solar system Milky Way universe star star system which big
• 10. The earth is one of the most important planets in the solar system, but there is only life on the earth in the solar system. Do you know why?
• 11. The earth is a special planet in the solar system A. the sunlight is stable for a long time B stars revolve around the sun in the same direction The structure and motion characteristics of C earth are special D the earth is suitable for living and reproducing
• 12. The earth is a common and special star in the solar system______ ．
• 13. The earth is a common and special star in the solar system______ ．
• 14. The speed of light is about 3 * 10 ^ 5 kilometers per second. It takes 10 years for the light emitted by a star to reach the earth. If the speed of light is 3.1 * 10 ^ 7 seconds per year, how many kilometers is the star from the earth?
• 15. The speed of light is about 3 × 10 5 power kilometers per second. It takes 12 years for the light emitted by a star to reach the earth. If the speed of light is 3.1 × 10 7 power seconds per year, how many kilometers is the star from the earth?
• 16. How long does it take to get from the moon to the earth at the speed of light
• 17. How long does it take to get to the moon by the fastest spaceship now RT
• 18. Do objects have the same mass on earth, moon and spaceship
• 19. How long does it take for an airplane (airliner) to arrive from the earth to the moon?
• 20. Light on a spaceship traveling at the speed of light If a forward beam of light and a backward beam of light are emitted from a spaceship flying at the speed of light, what are their respective speeds? If the forward beam of light flies at the speed of light, then it is the same as the speed of the spaceship. In this way, people behind the spaceship can not see what they are doing in front of them?