为什么Ia型超新星被认为是测量极大距离的强有力“标准烛光”？单项选择题

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Why are Type Ia supernovae considered powerful “standard candles” for measuring very large distances?

Why do things like Cepheid variable stars and Type 1 supernovae get referred to as "standard candles"?

A star (or other source) whose actual light output we know is called a standard candle. The name is intended to indicate a known, fixed light output, similar to a candle. Standard candles are useful for cosmology because we can use them to measure distances to celestial objects. If we know how bright a certain type of objects is, then we could figure out how distant it is on the basis of how bright it looks. Which of the following is a standard candle in cosmology?

Project A has a required return on 9.2 percent and cash flows of −$87,000, $32,600, $35,900, and $43,400 for Years 0 to 3, respectively. Project B has a required return of 12.7 percent and cash flows of −$85,000, $14,700, $21,200, and $89,800 for Years 0 to 3, respectively. Which project(s) should you accept based on net present value if the projects are mutually exclusive?

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