1. Neutron stars (pulsars, magnetars). They are not at all and it would be useful to know their exact locations.
2. Radio sources (active galaxy nucleus, Seifert galaxies, quasars, pulsars, black holes with substance accretion, supernova remains).
3. X-ray sources.
4.All galaxy clusters from Abell catalogue (For example - Galaxy cluster in the constellation Perseus, as in the figure)
Each such object must have a specific icon (according to the type) and a corresponding description.
