In the Early 1960s,physicists Named Penzias and Wilson Detected a Persistent

Multiple Choice

In the early 1960s,physicists named Penzias and Wilson detected a persistent noise at a wavelength of 1 mm in their radio telescope.The persistent noise that Penzias and Wilson detected came from all directions in the sky due to:

A) synchrotron emission from the Crab Nebula.
B) emission from newly formed stars in the Orion Nebula.
C) cell phone usage.
D) photons leftover from the Big Bang.