An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

A low-power telescope with a wide field of view attached to a larger telescope with the optical axes of both telescopes parallel. The finder is used to help point the larger telescope to the desired viewing location.

Agent noun of → find.

An → ESA spacecraft that was launched on December 3, 2015 to test technologies needed for the Evolved Laser Interferometer Space Antenna (eLISA), an ESA → gravitational wave observatory planned to be launched in 2034. LISA Pathfinder paves the way for future missions by testing in flight the very concept of gravitational wave detection.

LISA, short for → Laser Interferometer Space Antenna; → pathfinder.

1) A person who makes or finds a way, especially through unexplored areas or fields of knowledge.
2) An airplane, or a person dropped from a plane, sent into a target area to illuminate the area for succeeding aircraft (Dictionary.com).
3) → LISA pathfinder.

→ path; → finder.