Mercury mirror space telescope
A Mercury Mirror Space Telescope is a concept for a type of Reflecting Space Telescope which uses a dish of liquid mercury as its primary reflector. Conceptually, it is similar to an earth-based Mercury mirror Telescope, but instead of relying on earths gravity to maintain the necessary parabolic shape of the rotating mercury mirror, it relies on artificial gravity instead.
Other possibilities include using magnetic fields, or simply relying on internal pressure and surface tension effects to induce a usefully concave shape in the liquid mercury.
The concept is seen as an enabler of very large optical space telescopes, as a mercury mirror is potentially much lighter and cheaper than a contemporary glass mirror.