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Many objects observed in space advertise their presence by emitting energy.
However, it appears that many more objects may emit almost no radiation at all.
They ** must ** bend space-time if they have mass.
This topic is available for NewMars members who might wish to help to build up a collection of knowledge about a technology that might help humans to find objects orbiting the Sun or other objects.
A method of "finding" objects is to infer their presence by observing the behavior of observable objects.
That is an ** indirect ** gravity detection method. The curvature of space-time caused by an object is communicated to all other objects in the Solar System, so the presence of unknown objects can (occasionally) be deduced.
A method of finding objects whose influence has been deduced is optical occlusion. Astronomers are reported to have found asteroids (for example) by watching for occlusion of distant stars by objects whose presence has been inferred from behavior of visible objects.
What ** this ** topic is set up to study is direct measurement of curvature of space-time by objects we do not presently know exist.
The gravitational lens effect that is most pronounced occurs when entire galaxies bend light, but the Sun and perhaps even smaller objects have an observable effect.
Perhaps the day will come when humans will deploy a "gravity lens" detector to find nearby asteroids in the asteroid belt, when no other detection means is available.
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