About 20 things you should know about gravitation, how much do you know at the moment?

The law of "Gravitation" was published in 1687 by Isaac Newton in the Mathematical principles of natural philosophy. Is the law of gravity that explains the interaction between objects, and the laws that are followed by objects (particles) that are attracted by their gravitational mass. However, about the "gravitation" of the 20 things, do not know how much you know ...

1. In Star Wars, Obi-Wan said: "The force surrounds us, penetrates us, and it separates the galaxies." "What he's saying is" gravitation, "a force that, like its name, unites galaxies and also crosses our bodies so that we can land on both feet.

2. And the force has light and dark on both sides of the difference, the gravitation does not have two sides, he only attracts, does not repel.

3. NASA is trying to develop a "tractor beam" that can move objects better than gravitation.

4. The "microgravity" experienced by visitors to amusement parks and astronauts on the International Space Station-often referred to as "0 gravity"-is wrong-because they have the same rate of descent as the machines they ride.

5. There is a 150-pound Earth man who suddenly arrives at Jupiter (which is actually a lump of gas) and then turns into a 354-pound fatty, because Saturn has a massive gravitational pull.

6. To escape the Earth, you need to speed up to 7 miles per second-the so-called "escape speed".

7. Gravitation is the weakest of the "four fundamental forces", and the other three are: electromagnetism, the weak and the strong nuclear force.

8. A dime of the size of the magnet by enough electromagnetic force to overcome the gravity of the earth, affixed to the refrigerator door.

9. No Apple hit Newton's head, but Apple let Newton begin to think about what forces the moon to move around the earth.

10. Newton's Apple, which leads to Newton's law of gravitation: F = G * (MM)/r2. In other words, the size of gravity is proportional to the product of the mass of the two objects, inversely to the square of the distance between the two objects.

11. The formula above also means that the scope of gravitation is infinitely far ... I'm whoa!

The etymology of gravity comes from Latin gravis, meaning heavy and serious.

13. The Earth's gravity exerts the same acceleration on all things, without regard to quality, the oblique tower experiment on Galileo, though a rumor, is correct: under ideal conditions, objects of different mass will fall at exactly the same rate.

14. Einstein's theory of relativity, for the first time, viewed gravity as the result of "time-space" distortions. The universe is physically represented as a "tablecloth".

15. Any object with quality will distort the surrounding space-time, just like the one in this article. In 2011, the NAS Gravity probe B successfully observed the "drag-and-drop effect" of the Earth on the surrounding space-time, thus validating Einstein's theory.

16. Once a "time warp" occurs, mass objects sometimes distort passing rays, like lenses. Makes distant galaxies look weird.

17. The so-called "three-body Problem": the movement of three celestial bodies under the influence of gravitation, which plagued physicists for more than 300 years, had to be solved by 18 points, but only 16 were found--13 of which were obtained by the study of two Serbian scientists this March, This opened the outside of the rhythm of frighten a bunch of people.

18. While the remaining three basic forces are very happy to play with quantum mechanics-the Science of "small"-the gravitation is too great to play with them, and if gravity is placed in the equation of quantum physics, the equation is spoiled. How to let four small pots friends to live in harmony, this is a big problem that physicists face.

19. To better understand gravitation, scientists are looking for something like gravitational waves. A ripple that spreads in the universe may be caused by a collapse of a black hole or a stellar explosion, Amber Stuve, a scientist from the laser-interferometric gravitational Wave Observatory (LIGO) in Louisiana.

20. If the LIGO scientists had successfully observed this "gravitational wave", then our way of looking at the universe would be completely different, Stuver said: "Every time we change the way we observe the universe, we bring about a revolution in the understanding of the universe." This remark is very "heavy".