<![CDATA[Collision and merger of two black holes, resulting in the first detection of gravitational waves, GW150914, by LIGO. (Photo LIGO/SXS.) ]]>

652629 image 1636486372 1636486372 <![CDATA[Collision and merger of two black holes, resulting in the first detection of gravitational waves, GW150914, by LIGO. (Photo LIGO/SXS.) ]]> 1278