Image Details

Choose export citation format:

Optical Detection of Lasers with Near-term Technology at Interstellar Distances

  • Authors: James R. Clark

2018 The Astrophysical Journal 867 97.

  • Provider: AAS Journals

Caption: Figure 3.

Illustration of the forward (upper) and reverse (lower) cases. The dashed circles represent uncertainty in the orbits and positions of the two planets. The beams transmitted by our respective civilizations can be made narrower, to be seen more easily over the transmitting civilization’s star, or broader, to signal more of the solar system at once (even if we do not know where planets are within it). If a planet’s position is known, then the optimum beamwidth must be exactly wide enough to encompass the uncertainty in its position.

Other Images in This Article
Copyright and Terms & Conditions

Additional terms of reuse