Astrophysics and Space Science

, Volume 123, Issue 2, pp 297-303

First online:

On the detectability of antimatter propulsion spacecraft

  • Michael J. HarrisAffiliated withDepartment of Astronomy, University of Texas

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It is shown that the NASA Gamma-Ray Observatory will be able to detect large interstellar spacecraft at distances up to ∼ 300 pc by the γ-ray emission from the propulsion system alone. The distance limit is set by the possibility of recognizing such objects by their proper motions.