NASA's Hubble Rules Out One Alternative to Dark Energy

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ABOUT THIS IMAGE:

This illustration shows the location of Cepheid variables found in the spiral galaxy NGC 5584. Ultraviolet, visible, and infrared data taken with Hubble's Wide Field Camera 3 in 2010 reveal Cepheids of varying periods. Those stars with periods of less than 30 days and between 30 and 60 days are marked with green and blue circles, respectively. A small number of Cepheids, with periods larger than 60 days, are marked in red.

Object Name: NGC 5584

Image Type: Astronomical/Illustration/Annotated

Illustration Credit: NASA, ESA, and L. Frattare (STScI)

Science Credit: NASA, ESA, A. Riess (STScI/JHU), and L. Macri (Texas A&M University)

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