It has 2 moons, the average distance from the sun is 227,900,000 and its speacial features are that its reddish brown deserts.
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In a white dwarf, gravitational collapse is prevented by electron degeneracy pressure. this is a result of the pauli exclusion principle, which basically states that two electrons cannot occupy the same orbital/energy level at the same time.
Despite there being no answers listed by you, which the problem seems to be a multiple choice type of question, I'll go ahead and take a stab here.
What this problem is describing is basic nuclear fusion. Nuclear fusion is the process of which energy is released by a combination of two elements after they form into a brand new element. Once this happens, the bonded atoms have formed into a new, heavier nucleus.
