By the late 1980s, a suitable standard candle had been indentified: type Ia supernovae.

到上世纪八十年代末，一个合适的标准烛光出现了，它就是Ia型超新星。

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Using topography and gravity data collected by NASA’s Magellan spacecraft during the 1990s, scientists indentified nine hot spots on Venus.

使用NASA麦哲伦航天器（Magellan spacecraft）在1990年间收集的金星地形与重力数据，科学家最终确定了金星上9个火山活跃地区。

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Using topography and gravity data collected by NASA’s Magellan spacecraft during the 1990s, scientists indentified nine hot spots on Venus.

使用NASA麦哲伦航天器（Magellan spacecraft）在1990年间收集的金星地形与重力数据，科学家最终确定了金星上9个火山活跃地区。

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