When light hits the mirror and reflects, pressure is applied to the mirror.
This is called light pressure.
A sun yacht is a spacecraft whose thrust source is the light pressure from the sun.
It is often misunderstood, but it is not blown off by the solar wind.
The solar wind is a wind of gas that blows electricity from the sun, but it is not energy enough to use it as propulsion force.
In recent years, thin-film mirrors that are extremely lightweight and capable of holding an extremely large area and extremely high-performance thin-film solar cells have been developed.
Promotion and posture control in outer space has become practically feasible by using in combination with an ion engine that accelerates by using the charge of ions.
However, because the weight is over, people can not get on.
It is an unmanned spacecraft by program and remote control.
Regarding the course, choosing the route on the way is free.
From the start point near the space station on the earth's satellite orbit to the goal near the space station on the satellite orbit of Mars.
The race was competed by three sun yachts.
Although there were five ships, two of them were not able to even start and abstained.
You can not maintain your advantage, even if you can head at the beginning of the race.
It is impossible to separate the yacht from the sun even if you change your course no matter how long it takes to break the ship with the sun.
Also, since it is three, it is difficult to bargain as game theory.
So the first sun yacht race was extremely fierce. However, no one knows the race result.
This is because the world final war broke out on the earth while developed countries were doing this in the universe like this sun yacht race.