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Hubble Space Telescope image of spiral galaxy NGC 4603. It is the most distant galaxy with Cepheids used to measure the Hubble Constant.
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NASA

Scientists Find the True Hubble Constant!
News story originally written on May 26, 1999

Scientists have found the real Hubble Constant after 8 years of research. The Hubble Constant is the rate that the Universe is expanding at. They found it to be 70 kilometers per second per megaparsec.

The constant is used to find the age of the Universe. Scientists say the Universe is 12 billion years old. That's a long time!

Special stars called Cepheid variable stars were used. Scientists can use them to find distances between galaxies. The Hubble telescope was named after Edwin Hubble, the first to believe the Universe is expanding.

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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information. NASA ESIP NCSE HHMI AGU AGI AMS NOAA