The phrase "elongated shape" refers to something that is longer than its regular or normal size or proportions. It means that the object or form has been stretched or extended to become longer than its typical form. Full definition
In the background are the blue and red elongated shapes of many other galaxies, which lie at vast distances from us — but which can all be seen by the sharp eye of Hubble. (sciencedaily.com)
The same effect can alter the rotation speeds and orientations of asteroids with elongated shapes, the team found. (sciencemag.org)
Gas and dust clouds in 30 Doradus, also known as the Tarantula Nebula, have been sculpted into elongated shapes by powerful winds and ultraviolet radiation from these hot cluster stars. (apod.nasa.gov)