Elon Musk could hardly contain his excitement when Donald Trump mentioned Mars in his inauguration speech. The new president proclaimed that his administration will be the first go to Mars, and place the US flag on the red planet.

Elon Musk could be seen making a bizarre gesture in response to US President Donald Trump's pledge to send astronauts to Mars during his inaugural speech.

Getting humans to Mars has long been an obsession for SpaceX CEO Elon Musk. On Monday, that project got a full endorsement from the newly sworn-in president. During his inaugural address, President Donald Trump promised he would “pursue our manifest destiny into the stars,