Class S-T

Classification

Class S-T - Ultragiant

Age

2-10 billion years

Diameter

10 - 50 million km (Class S) / 50 - 120 million km (Class T)

Location

Cold Zone

Surface

Tenous, composed of gaseous hydrogen and hydrogen compounds; radiates considerable heat

Atmosphere

Zones may vary in temperature, pressure and composition; water vapor may be present

Life-forms

Unknown