此时温度降到10亿摄氏度，质子和中子开始形成原子核-带电原子的内核。
At a temperature of one billion degrees Celsius, protons and neutrons start to come together to form nuclei, the charged cores of atoms.
14秒后，温度是30亿度，第一个氘原子核形成了。
14 seconds later, the temperature became 3 billion degrees, forming the first deuterium atom.
此时宇宙已冷却到1000摄氏度，温度低到电子开始登场并结合原子核形成大量的原子。
The universe has cooled to about 1, 000C - cool enough for electrons to pair up with nuclei to form the first atoms.
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