Alex Filippenko
= Alex Filippenko
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= Alexei V. Filippenko
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{synonym}
= A. V. Filippenko
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<Alex Filippenko> studies exploding <stars> and the use of <supernovae> as cosmological probes. He coauthored both major late-1990s analyses that compared distant <Type Ia supernovae> with nearby reference samples.
The technique connects a standardized <supernova> <luminosity> to its measured brightness, then compares the inferred <luminosity distance> with <cosmological redshift>. The distant events favored models with an accelerating cosmic expansion. Their interpretation required checking extinction and other systematic changes that could also make distant sources appear faint.<Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant by Adam Riess and others>[Author list and abstract: supernova distances, cosmological fits and systematic tests]{ref}<Measurements of Omega and Lambda from 42 High-Redshift Supernovae by Saul Perlmutter and others>[Author list and abstract: independent standardized supernova sample]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/Alexei_Filippenko.jpg?width=260]
{title=Portrait of <Alex Filippenko>}
{description=Jeffrey Silverman. https://creativecommons.org/licenses/by-sa/3.0/[CC BY-SA 3.0], via Wikimedia Commons.}
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