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Galaxies and Cosmic HistoryModule 6The Dark Universe and Cosmic Futures
Module 6 / Lesson 22 of 2444 min
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What Evidence Supports Accelerated Expansion?

How do calibrated distant explosions and other probes constrain expansion history?

Follow a supernova's calibrated brightness into a distance, compare expansion histories, and separate evidence for acceleration from claims about what dark energy is.

An artistic view of a complete tilted spiral galaxy, a blue-white luminous point on its outer right arm, and much smaller background galaxies.
Vastward-generated concept art. The galaxy field and luminous point introduce the search for expansion-history clues; their brightness, spacing and colour are not measurements of acceleration or dark energy. Full original frame; not a reconstruction of SN 1994D.

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