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"I've got this beautiful panoramic three-dimensional painting of Mars based on Martian photos. It's 30 feet wide. You can pick out every pebble on the Martian landscape. And who'd have dreamed you could do that?"
- Arthur C. Clarke

Gravitational Wave Viewer  
  A device used to see at astronomical distances.  

"The adjustment of the instrument needed a lengthy preparation. It was difficult to determine the exact direction in which the axis of the cone of gravitational beams should be positioned. This cone of beams had to be transmitted to overtake the light that was reflected from the planet at the time of the event and which was now on its way through space. This light had to be brought back again. After the returning waves of gravitation had been transferred into light again and after they had passed the optical relay, a picture of the searched for area could finally be projected on a screen in a dark room."
From Two Planets, by Kurd Lasswitz.
Published by Not known in 1897
Additional resources -

Thanks to Walt Bradley for writing in with this one.

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Additional resources:
  More Ideas and Technology from Two Planets
  More Ideas and Technology by Kurd Lasswitz
  Tech news articles related to Two Planets
  Tech news articles related to works by Kurd Lasswitz

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