# Can the Earth be used as a gravitational lens?

Could the Earth be used as a gravitational lens to image very far distances with an effective aperture that would be far greater than any telescope? How far away from Earth would an observing spacecraft have to get to enter the focal point, and see very far at a resolution? Would that enable the direct imaging of small planets around other stars?

• Using the Earth as a gravitational lens might be impractical, but a tangentially related idea of the Aragoscope might be more feasible. For example, a uniform wall built around the equator of the moon could be used to form the opaque disc of a Aragoscope. – Xavier Jul 2 '20 at 5:47

• For scale, $15300$ AU is roughly a quarter of a light year (which is $63241$ AU). $15300$ AU is in the Oort cloud. – StephenG Jul 1 '20 at 20:42