Is it possible to block out the Sun from the Earth?

"In order to prevent the sun from hitting the light, it means that there is at least one area enough to make it dark." This is the magic occurring during the total solar eclipse. If you are lucky enough (or in focus) to the shadow of the moon projected on the surface of the earth, you will not be exposed to direct sunlight for several minutes to reach you. It will darken it, you can think hardly that the sun has gone. (And it will be replaced by the most beautiful sight that you can see: the sun is rising at the edge of the moon The sun is rising, but I am attracted ...)

If you mean "all sunlight does not hit anywhere on the earth", we need to break up the problem further:

What you say is "use the knowledge, skills, and materials we currently possess in reality". To accomplish this, you need something slightly larger than the entire planet. There may be enough raw materials to produce a (very thin) sail with an area of ​​130 million square kilometers. But in reality it has grown something even worse, brought it into space and put it in the right place ... impossible

"Naturally, having unlimited energy, unlimited material, no friction, high quality containers, airless resistance, and physical exercise always have convenient assumptions to make things simple "Pick up Jupiter, remove its mass percentage 99, place it at the L1 Lagrange point, and attach the rocket to keep shooting so that it remains within an unstable equilibrium point. It is overnight. :)

Finally, if you want to prevent all sunlight from keeping our solar system away from any direction, you already guess this "reality" part: there is no way

In theory, you will imagine a concept similar to the concept of Dyson spheres. Please do your best.

The 2014 report released in the magazine "The Future of the Earth" is a report of 2014 that explodes 100 nuclear warheads to block the sun's light and photosynthesize the plants, for decades the black soot of terahertz We found that it is possible to put it in. It has become impossible to starve all the planets without killing deaths from living things that deprive of radiation and climate to death. The United States and Russia now each have about 7000 nuclear warheads. In 1983, Soviet Defense Army officer Stanislav Petrov received notification from the Soviet Early Warning System that the United States began intercontinental ballistic missile attack against the Soviet Union. The standard protocol for this notification is to counterattack immediately after issuing a warning, but Petrov does not think it is correct and is calm. I found that this is a false alarm due to technical failure.

Let me explain some background on how these three factors affect the global climate. First, asteroids evaporate rocks and send dust into the atmosphere of the earth. This will block the sun, cool the earth, and reduce the sunlight for photosynthesis of plants. Carbon dioxide emissions of greenhouse gases cause the sun's heat to be trapped in the atmosphere. Finally, sulfur gas also blocks sunlight and causes the earth to cool down. But you can see that there are two variables to cool the earth and another variable to heat the earth. Therefore, the relative amount of each variable is important to understand the global climate.