Ordinary baryonic matter had too high a temperature, and too much pressure left over from the big bang to collapse and form smaller structures, such as stars, via the Jeans instability.

• 普通重子物质具有太高的温度，而离开大爆炸之后压力太高而不能坍塌而形成更小的结构，例如经过琼斯不稳定性形成星星。