Glossary term: 宇宙大爆炸理论
Description: 宇宙大爆炸理论是对宇宙演化阶段的基本解释。简单的讲，该理论让我们了解到宇宙的起源，即从炙热、致密的早期阶段开始，经过 138 亿年的膨胀，最终成为我们今天所知的宇宙。今天，我们可以在哈勃图中看到这种膨胀的证据。
由于我们现有的工具无法让天文学家直接回溯到宇宙的起始阶段，因此我们对宇宙大爆炸理论的理解大多来自数学模型和理论。不过，天文学家可以研究大爆炸后几分钟内产生的化学元素丰度（称为大爆炸核合成）。天文学家还可以研究大爆炸留下的光学余辉，这种现象被称为宇宙微波背景辐射。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
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