Answer: President Barack Obama is trying to inform Americans about future space exploration.
Step-by-step explanation:
I see no text included but I assume this is based on President Obama's speech on space exploration at John F. Kennedy Space Center in April 2010 and if it isn't, the above answer applies to most texts where the former President spoke on Space exploration.
The central idea of the text is President Obama informing the people of the future of space exploration for the United States.
He spoke of how he was committed to giving NASA the support it needed to send humanity further into space. First landing on an asteroid and then landing on Mars. He also informed the public of some of the things that will be needed to make such goals possible such as the development of new propulsion systems.