circular

So if you go directly from a straight section to a circular curve, the centrifugal force comes on abruptly.

Except, your motion isn’t perfectly circular.

And from six kilometres up, the landscape looks bizarre: there are very few large-scale circular features like that in the world.

Because these enormous masses all gravitationally tug on each other, our galaxy’s motion is much more helter-skelter than a clean, circular orbit.

Building such a large flat surface so close to the sun will turn it effectively into a solar sail and push it out of position, so instead of one giant circular object, our mirror will consist of many different pieces.