• The Kepler space telescope looks for planets by measuring tiny decreases in the brightness of stars when planets cross in front of them.

    VOA: special.2011.02.09

  • An astronomer at Harvard College, Henrietta Leavitt, had discovered that these periods of brightness could be used to measure the star's distance from Earth.

    VOA: special.2009.04.29

  • Scientists say small changes in the sun's brightness can produce effects on Earth similar to two weather events in warm waters of the Pacific Ocean.

    VOA: special.2009.09.29

  • Visitors can enjoy the brightness and color of the universe she created.

    VOA: special.2010.04.14

  • Cepheid variable stars are stars whose brightness changes at regular periods.

    VOA: special.2009.04.29

  • All the brightness fled from the boy's face.

    VOA: special.2010.05.15

  • He studied their shape and brightness.

    VOA: special.2009.04.29

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