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PBS NewsHour

Evidence of cosmic inflation expands universe understanding

6:44

Scientists say they have found evidence confirming a theory that our cosmos expanded from almost nothing to its first huge growth spurt in just fractions of a second after the Big Bang. A telescope at the South Pole revealed patterns and skewed light waves created by gravitational ripples from the incredible expansion. Gwen Ifill interviews Sean Carroll of the California Institute of Technology.

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PBS NewsHour

State of the Union 2016

PBS NEWSHOUR offers live coverage of President Obama's speech and the Republican response.

0:20

PBS NewsHour

PBS NewsHour Weekend

Premieres Saturday, September 7, 2013 at 6 p.m. ET.

0:30

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