The primary agent for Type Ia supernova cosmology is the uniformity of their appearance. We present the current status, achievements and uncertainties. The Hubble constant and the expansion history of the universe are key measurements provided by Type Ia supernovae. They were also instrumental in showing time dilation, which is a direct observational signature of expansion. Connections to explosion physics are made in the context of potential improvements of the quality of Type Ia supernovae as distance indicators. The coming years will see large efforts to use Type Ia supernovae to characterise dark energy.

中文翻译：

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Ia 型超新星宇宙学

Ia 型超新星宇宙学的主要因素是它们外观的一致性。我们介绍当前的状态、成就和不确定性。哈勃常数和宇宙膨胀历史是 Ia 型超新星提供的关键测量值。它们还有助于显示时间膨胀，这是膨胀的直接观察特征。与爆炸物理学的联系是在 Ia 型超新星作为距离指标的质量潜在改进的背景下进行的。未来几年将会有大量努力使用 Ia 型超新星来表征暗能量。