Tenacious-Techhunter
Mongoose
Tom Kalbfus said:You wouldn't want to do this with Earth, but Venus needs the shade if it is to be properly terraformed some day. The shade takes the form of a ring shaped giant solar collector, Actually it is one giant solar power satellite that stretches all the way around the planet in a 24-hour orbit. A one point on the inside of this Solar Collector is a light source that shines down on Venus with Earth level illumination, the rest of the energy collected goes into antimatter production. The antimatter produced is anti-hydrogen, but that in turn is fed int a series of fusion reactors, the anti-hydrogen is fused into anti-helium, the anti-helium is fused into anti-carbon and so on until anti-mercury is produced. Anti-mercury would make an excellent starship fuel, it is very dense, 13.546 tons/meter^3, liquid hydrogen is 0.070 tons per cubic meter. A displacement ton can hold 1 ton of liquid hydrogen or 189.644 tons of liquid mercury. Mercury is also a liquid at room temperature, it can fit in a small space, which makes containing antimatter in mercury form that much easier, as there are fewer walls you have to prevent it from coming in contact with. This makes an antimatter reactor nice and compact although very heavy! When it gets used up you discard it!
No one is going to waste the material to make this a sphere, or even a cylinder. It would be a challenge to make a large enough circle. It would have to be a statite on the far side of Venus’s L1 (to balance out the push of the solar wind); it would need lots of Reflectance Control Devices, as featured on Ikaros, in order to stay in position. The anti-matter thing is a non-starter; where are you getting these baryons to make antimatter from???