What is a Low Earth Orbit?

Earth orbit refers to the path of the earth around the sun. It is generally an ellipse with a small eccentricity. Its semi-major axis (a) is 1.496 × 10 ⁸ kilometers; the semi-minor axis (b) is 1.4958 × 10 ⁸ kilometers. ; Half focal length (c) 25 × 10 ⁵ km; perimeter (l) 9.4 × 10 ⁸ km. The eccentricity (e) and oblateness (f) of the Earth's elliptical orbit are (1/60 or 0.016 and 1/7000), respectively. The sun is located at a focal point of the ellipse. The distance between the earth and the sun varies from 1.471 × 10 ⁸ to 1.521 × 10 ⁸ kilometers, with an average distance of 1.496 × 10 ⁸ kilometers. The plane of the Earth's orbit is the ecliptic plane.

Earth orbit

Average orbit radius 384,

Earth affected by the sun

Because the elliptical orbit is a compromise between the earth's gravitational attraction to nearby celestial bodies. A system with only one planet and one star

Earliest

Human calendar

Scientists imagine

German art

Satellite tracking system

Rauchman established the "Jump the Earth" site in 2005 and launched the "Jump Earth Day" (WorldJumpDay), calling on people in the Western Hemisphere on July 20, 2006, 11:39:13 GMT 39 minutes and 13 seconds) Jumping into the air together, saying that as long as 600 million people make such a jump at the same time, it will be able to change the position of the earth in the universe, and even if the earth changes its orbit and exits the sun a little, thus "stopping global warming and extending Hours of day to create a more human-friendly climate. "

Rauchman originally proposed "Earth Jump Day" to scientists and bloggers. Only when he talked in the circle of friends, the news spread and became a global topic. Curious, fun, and good people went online, and the site was crowded several times. Qi jumps to the sun in an instant, and 598,104,080 people have registered to participate, nearly half of the world's Internet users. The site claims to have reached 600 million people on the 20th.

Six hundred million people jumped synchronously and took the earth out of orbit. It belongs to a kind of "geoengineering". It has a good intention, but there are many problems and it is difficult to take it seriously. From a moral perspective, who can bear the consequences of a change in the Earth's orbit? Some people say that the Earth is in a new orbit. Isn't the calendar to be rewritten? Others say, who can guarantee that so many people really take off in the same second?

But the real question is, is this jump really useful? According to "crazy physics" devoted to weird ideas. Assuming that each person weighs one hundred kilograms, 600 million people will be 10 squared by 11 and then multiplied by 6. The kinetic energy generated by their jumps is equivalent to 7.5 megajoules (TJ), equivalent to one million tons of yellow explosive (equivalent to a modern 2% of the energy released by the hydrogen bomb), resulting in a displacement of the earth by only one radius of the hydrogen atom, that is, the Earth's orbit remains unchanged.

The celestial body is coming quietly towards the orbit of the earth

Great Britain

Zodiac plane

The BBC reports that scientists have calculated that the distance of 2.4 kilometers from the sun can offset the treble of carbon dioxide in the atmosphere, but this requires millions of hydrogen bombs to bomb the earth. Will the earth be there by then?

The idea of man's victory has never been broken since ancient times. For example, human beings have always wanted to control or change the climate, and this idea is eager after they have messed up their living environment with greenhouse gas. There is a cure for the earth. There is a cure. The cure is to reduce or stop greenhouse gas emissions quickly. It is not easy to see the current performance of human beings.

The cure is geoengineering. For example, volcanic eruption is taken, and numerous sulphurpellets are shot into the air, which increases the reflection power to block out sunlight. Already.

The National Academy of Sciences knows that allowing 55,000 mirrors to enter the orbit and reflecting the sunlight can offset the effect of doubling carbon dioxide, but each mirror must be 100 square kilometers large, which is not feasible. It seems that "geoengineering" is easier said than done.