TrES-4

TrES-4 is the fourth planet from VY Canis Majoris and the largest within the Canis Majoris system. TrES-4 and the other gas giants—HAT-P-32 b, Kepler 39b, and Planus—are sometimes referred to as "Trestian planets."

Planetary composition
TrES-4 is composed of a relatively small rocky core, surrounded by metallic hydrogen, surrounded by liquid molecular hydrogen, which is surrounded by gaseous hydrogen. There is no clear boundary or hard surface between these different phases of hydrogen; the conditions blend smoothly from gas to liquid as one descends.

Natural satellites
TrES-4 has 3 moons. For a complete listing of these moons, please see TrES-4's natural satellites. For a timeline of their discovery dates, see Timeline of discovery of exoplanets and their natural satellites. The three large moons, known as the "Trestious moons", are Nolam, Wendriel and Ploymen.