A mysterious star that some astronomers believe could harbor an “alien megastructure,” continues to confound researchers.

A study accepted for publication in the Astrophysical Journal has only “deepened the mystery” surrounding the strange light pattern emitted from the star known as KIC 8462852.

Josh Simon of the Carnegie Institute and Ben Montet of Caltech analyzed data gathered by the Kepler space telescope during the four-year period the telescope observed KIC 8462852, Carnegie Science said in a statement.