"Type Ia supernovae, known as "standard candles" in astronomy, have consistent properties that make them good markers of distance when peering at galaxies across the universe. In fact,studies of this kind of exploding star a decade agoproduced one of the most significant scientific discoveries in recent history: that the universe is expanding at an accelerating rate, thanks to the influence of so-called dark energy."
We can read the above paragraph in the Scientific American article below.
We are eager in Mexico to have Alex Filippenko explain to us his particiaption in the two teams involved in that fundamental discovery more than ten years ago.
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