The Photon Sphere is a spherical region of space where gravity is strong enough that photons are forced to travel in orbits. If you were to stand in this region and look straight ahead you would see the back of your head.
In 1993 there was a proposal to build a giant advertising billboard in outer space that would appear roughly the same size and brightness as the moon. The project didn’t meet funding and inspired a bill to ban all advertisement in outer space.
In 2007 China tested a missile and shot down one of their own satellites, accidentally creating 2,087 pieces of space debris on crazy orbits, all of which are now required to be tracked to avoid space collisions.
The first nuclear missile test in space was “starfish prime”, which knocked out several allied satellites and disabled communications in Hawaii.
There are 5 so-called “Lagrangian Points” wherein the gravitational effects from the Sun and Earth balance out. These points could act as a solar parking space for objects within their limits.
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