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May 7, 2009 09:00 AM (EDT)

News Release Number: STScI-2009-08

Refined Hubble Constant Narrows Possible Explanations for Dark Energy

All images from this news release:

Cepheid Variable Stars in Spiral Galaxy NGC 3021 Image Type: Astronomical/Illustration Cepheid Variable Stars in Spiral Galaxy NGC 3021PRC2009-08a
Three Steps to the Hubble Constant Image Type: Illustration Three Steps to the Hubble ConstantPRC2009-08b
HST ACS/WFC Image of NGC 3021 Image Type: Astronomical HST ACS/WFC Image of NGC 3021
NGC 3021 NICMOS/ACS Detail 1 Image Type: Astronomical NGC 3021 NICMOS/ACS Detail 1
NGC 3021 NICMOS/ACS Detail 2 Image Type: Astronomical NGC 3021 NICMOS/ACS Detail 2
NGC 3021 NICMOS/ACS Detail 3 Image Type: Astronomical NGC 3021 NICMOS/ACS Detail 3
NGC 3021 NICMOS/ACS Detail 4 Image Type: Astronomical NGC 3021 NICMOS/ACS Detail 4
Compass and Scale File for NGC 3021 Image Type: Astronomical/Illustration Compass and Scale File for NGC 3021
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