Arno Penzias and Robert Wilson

Arno Penzias and Robert Wilson

Arno Penzias and Robert Wilson

In the mid-1960s, Arno Penzias and Robert Wilson detected leftover, cooled down radiation from early in the Universe's history by carefully scanning the sky with a device called the Holmdel Horn Antenna. Their discovery was of huge importance to cosmology and won them the Nobel prize.

This cosmic microwave background radiation was later mapped in greater detail by NASA's Cosmic Background Explorer (COBE) mission in the early 1990s and the Wilkinson Microwave Anisotropy Probe (WMAP), launched in 2001.

Image: Arno Penzias (left) and Robert Wilson in 1978 outside the Holmdel horn antenna (credit: Physics Today Collection/AIP/SPL)

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Arno Penzias and Robert Wilson

Introduction

Astronomers find traces of the early Universe.

About Arno Penzias and Robert Wilson

The accidental discovery of cosmic microwave background radiation is a major development in modern physical cosmology. Although predicted by earlier theories, it was first found accidentally by Arno Penzias and Robert Woodrow Wilson as they experimented with the Holmdel Horn Antenna. The discovery was evidence for an expanding universe, (big bang theory) and was evidence against the steady state model. In 1978, Penzias and Wilson were awarded the Nobel Prize for Physics for their joint discovery.

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