There could be many answers to this including serious, philosophical, spiritual, mathematical, and then the nonsense and funny answers. My opinion is that there are many secrets we have yet to learn about our universe. For an example of one amazing secret of our universe, read about the "Divine Ratio", also called the Divine Proportion, Phi, the Golden Ratio and several other names. So many of the things we call beautiful, including the human face, the spirals of a sea shell, and what seems like all the natural world is built upon the same formula that involves this specific proportion. See the links below for information to get you started. It is an amazing and eye opening concept, and definitely a secret that you can discover in use all over our universe.
Phi/The Divine Ratio = 1.61803
Another answer:
I have two theories, one is pi = 3.14159265358979323
And the one which i am pretty sure about is... The Secret of the Universe is to live!
Another answer:
In a movie*, the secret of the universe (or anything at all) is 42.
*From: Hitchhikers Guide to the Universe
Another answer:
Love... but, secrets should be kept secret shouldn't they?!
The motto of Incredible Universe is 'If it's not in the Universe, it doesn't exist!'.
The Hidden Universe was created in 1950.
The Universe has an age estimated to be about 13.8 billion years.
The duration of Wonders of the Universe is 3540.0 seconds.
No such thing. Theres a Secret Place and Secret Key.
Secret Rhythm of the Universe was created in 2001.
George's Secret Key to the Universe was created in 2007.
The ISBN of George's Secret Key to the Universe is 9781416954620.
"George's Secret Key to the Universe" by Lucy & Stephen Hawking has approximately 336 pages.
nobody know except god
The cast of The Secret Universe of Paul Laffoley - 2014 includes: Paul Laffoley as Paul Laffoley
The Mind of the Married Man - 2001 The Secret of the Universe - 1.2 was released on: USA: 29 September 2001
Earthworm Jim - 1995 The Great Secret of the Universe 1-10 was released on: USA: 11 November 1995
The Mind of the Married Man - 2001 The Secret of the Universe 1-2 was released on: USA: 29 September 2001
Voltron Defender of the Universe - 1984 Secret of the White Lion 1-10 was released on: USA: 28 September 1984
Everything appear to be pointless because eventually you must die. To live you must die...that is the secret to life. The secret to the universe is inaccurate because of the existence of opinion. Therefore there is no secret...just no purpose. Nothing truly matters if everything must end eventually. The only objective one could have is to avoid suffering while you're alive.
as big as the secret to life, the universe, and everything, so very very big