  Blazars are active galactic nuclei whose ultra-relativistic jets are
coaligned with the observer direction. They emit throughout the whole e.m.
spectrum, from radio waves to VHE gamma rays. Not all blazars are discovered.
In this work, we propose a catalog of 54 new candidates based on the
association of HE gamma ray emission and radio, X-ray an optical signatures.
The relevance of this work is also that it was performed by four high school
students from the Liceo Scientifico Statale Ugo Morin in Venice, Italy using
the open-source platform Open Universe, in collaboration with the University of
Padova. The framework of the activity is the Italian MIUR PCTO programme. The
success of this citizen-science experience and results are hereafter reported
and discussed.
