More Videos

Obama lays a wreath at Hiroshima Peace Memorial Park 02:18

Obama lays a wreath at Hiroshima Peace Memorial Park

President Obama thanks military members in Hiroshima, Japan 07:43

President Obama thanks military members in Hiroshima, Japan

"We are not bound to repeat the mistakes of the past," says Obama in Hiroshima 17:13

"We are not bound to repeat the mistakes of the past," says Obama in Hiroshima

Donald Trump faces tough terrain in Washington state 00:46

Donald Trump faces tough terrain in Washington state

In Hiroshima, no expectation of apology from Obama 02:21

In Hiroshima, no expectation of apology from Obama

Young Bradenton entrepeneurs discuss government's role in the economy 02:02

Young Bradenton entrepeneurs discuss government's role in the economy

Visitors pay respects at Vietnam Veterans Memorial 01:15

Visitors pay respects at Vietnam Veterans Memorial

Americans agree, it's time for Obama to visit Hiroshima 02:27

Americans agree, it's time for Obama to visit Hiroshima

Florida 6th Grader Wins National Geographic Bee 00:39

Florida 6th Grader Wins National Geographic Bee

A look back at Obama’s visit to Vietnam 01:58

A look back at Obama’s visit to Vietnam

Fast, long-term relief from opioid dependence? 00:41

Fast, long-term relief from opioid dependence?

President Obama lands in Vietnam 00:52

President Obama lands in Vietnam

Share Video

Einstein was right: Gravitational waves exist

For the first time ever, scientists have detected gravitational waves - or ripples in space time - using a precise measuring device called LIGO. The discovery supports Albert Einstein’s theory of general relativity, which predicted the existence of gravitational waves. The detection was also the first time a Binary Black Hole system was directly observed by scientists.
National Science Foundation and LIGO

Editor's Choice Videos