Two nuns are riding their bikes down the back streets of Rome.
One says breathlessly, "I've never come this way before!"
To which the other replies, "It's the cobblestones."
3K radiationIn 1965, Arno Penzias and Robert Woodrow Wilson detected a 3 degree kelvin primordial background radiation using a horn reflector antenna built for radio astronomy. The Big Bang description of the origin of the universe took place 15 to 20 billion years ago in an explosion from a hot dense state. The high energy radiation produced when the universe was very young and very hot would have been absorbed and degraded as the universe expanded and cooled. The microwave background radiation first observed by Penzias and Wilson is thought to be a relic of this very early state, when the universe was only about a million years old. The uniformity of microwave background indicates that the universe was homogeneous until it was a few million years old. |
