Back in time to the Big Bang (cont.)
Ellen A satellite named
COBE (COsmic Background Explorer) has taken a picture of the cosmic background
radiation. Imagine: this picture shows the whole Universe! It is one of
the great successes of the Big Bang model that it actually can explain
the existence of this radiation. It comes from all directions, with very
similar intensity.
Tim Isn't that radiation dangerous? It must be very energetic!
Ellen Only at the beginning. But now, the Universe has become
more than a thousand times bigger since the time when this radiation was
emitted. The waves have been 'stretched', and the energy of the light
is now 1000 times less than before.
Tim I see. The cosmic background radiation is the leftover
from the matter-antimatter annihilations. And we're all made from the
leftover matter.
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