<Dd> 2 e + 2 e → 2 γ (2 x 1.0 MeV) </Dd> <Dd> 2 H + 2 H → 2 He + 2 γ (2 x 5.5 MeV) </Dd> <Dd> 2 He → He + 2 H (12.9 MeV) </Dd> <P> These reactions result in the overall reaction: </P>

What are the properties used to describe stars in space