  Our universe is probably a huge black hole. If that is true, all the light
and heat ejected by various celestial bodies into the space will be confined
within it and shuttling ceaselessly, leading eventually to a uniform
equilibrium radiation at certain temperature. The authors hold that the 3 K
background radiation discovered in 1965 is actually such equilibrium radiation.
The 3 K background radiation is convincible evidence that our universe is a
closed one and it is actually a huge heat ocean.
  Billions of galaxies produced in the big bang will also be shuttling within
the closed universe, passing the central part of the universe again and again.
They have many chances to meet each other. There are numerous black holes of
various sizes in these galaxies. A black hole absorbs matter and radiation,
even swallows in other approaching celestial bodies. These black holes provide
the mechanism of matter-re-gathering and energy-re-gathering in the universe.
All the real matter will finally gather again to form a single huge black hole.
The huge black hole absorbs energy from the heat ocean further, until its
energy overpasses certain threshold value, leading to a new big bang.
  The heat ocean has energy, hence it has mass, too. Calculations show that,
the mass of the heat ocean surpasses overwhelmingly the mass of all the real
matter. The heat ocean is the dominant part of the universe, and the real
matter is only a fraction, which explodes and re-gathers repeatedly within the
universe.
