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GRE阅读高频机经原文30：Supernovae&Obscurat by dust
Supernovae & Obscuration by dust
Recently, significant progress has been made by using Type Ia supernovae as ``standardizable candles''. Supernovae are rare - perhaps a few per century in a Milky-Way-sized galaxy - but modern telescopes allow observers to probe very deeply into small regions of the sky, covering a very large number of galaxies in a single observing run. Supernovae are also bright, and Type Ia's in particular all seem to be of nearly uniform intrinsic luminosity (absolute magnitude , typically comparable to the brightness of the entire host galaxy in which they appear)They can therefore be detected at high redshifts , allowing in principle a good handle on cosmological effects .
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