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Big Questions

  • How Does the Universe Work?

    How does the universe work? Understanding the Universe's birth and its ultimate fate are essential first steps to unveil the mechanisms of how it works. This, in turn, requires knowledge of its history, which started with the Big Bang.

  • How did we get here?

    How did we get here? In order to understand how the Universe has changed from its initial simple state following the Big Bang (only cooling elementary particles like protons and electrons) into the magnificent Universe we see as we look at the night sky, we must understand how stars, galaxies and planets are formed.

  • Are we alone?

    NASA Science seeks answers to questions that are as old as humanity.