The earth we live on is a relatively small planet in the solar system

The earth we live on is a relatively small planet in the solar system. Apart from the sun, which is the only star in the solar system, the rest are non luminous objects. They include eight planets, sub planets, satellites of some planets, asteroids, comets, Kuiper bodies, Oort clouds and interstellar dust. Together with the sun, they form the solar system, The sun guides the solar system around the center of the Milky way

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1. Earth solar system Milky Way universe star star system which big
2. 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?
3. Solve the equation about X: X2 - (P2 + Q2) x + PQ (P + Q) (P-Q) = 0
4. If P and Q are two real roots of the equation x2 + (m-2) x + 1 = 0, then (1 + P2 + MP) (1 + Q2 + MQ)=
5. If p2-p-1 = 0, 1-q-q2 = 0 and PQ ≠ 1, then the value of PQ + 1q is () A. 1B. 2C. 12D. 2−12
6. φ (x) = x ^ 4 + (2 - λ) x ^ 2 + 2 - λ, φ (x2) - φ (x1) = (x2 + x1) (x2-x1) (x2 ^ 2 + X1 ^ 2 + 2 - λ), what is the process of factorization What is the process,
7. Decomposition factor: M2 (m-1) - 4 (1-m) 2=______ ．
8. Decomposition factor; (M + 1) square-9 (m-1) square It's a process
9. Given that the log is 0.3 B 2 to the power of 0.1 and C 0.2 to the power of 1.3, the size relation of the real number a B C is as follows
10. First order solution of one variable 1. After 1.5 hours of meeting, the two cars continue to drive for 0.8 hours. At this time, the bus is 19 kilometers away from the ground of B and the truck is 65 kilometers away from the ground of A ① How many kilometers more buses travel than trucks per hour? ② How many kilometers are there between a and B?
11. What are the characteristics of the planets and stars in the solar system
12. The earth is the home of human existence, it belongs to () A. Stars B. planets C. satellites D. comets
13. 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,
14. What are the stars, planets and satellites in the solar system?
15. Why is the earth an ordinary planet in the solar system
16. It shows that the earth is an ordinary planet in the solar system
17. How to explain that the earth is an ordinary planet in the solar system
18. 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
19. 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
20. The earth is a common and special star in the solar system______ ．