So much happened in the earliest moments of the universe. Elementary particles appeared, the first nuclei of hydrogen and helium, and fluctuations of energy and matter set into motion the formation of ...

A: In the standard Big Bang model, the universe evolved from a state in which it was extremely hot, dense, and opaque, and it has been expanding (and cooling) ever since. In the cosmos’ early history, ...

Two scientists, Arno Penzias and Robert Wilson, discovered the cosmic microwave background in the mid-1960s while testing a large radio antenna for Bell Laboratories. They detected a constant signal ...

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The Cosmic Microwave Background Radiation is the afterglow of the Big Bang; one of the strongest lines of evidence we have that this event happened. UCLA's Dr. Ned Wright explains. "Ok, I'm Ned Wright ...

The most detailed snapshots so far of the infant universe are confirming that the cosmos consists mostly of mystery material, called dark energy, that accelerates the universe’s expansion. The new ...

Artist's concept of the Cosmic Background Explorer (COBE) spacecraft. John Mather shared the Nobel Prize in Physics in 2006 for his work with the Cosmic Background Explorer, or COBE. Launched in 1989, ...

This image unveiled March 21, 2013, shows the cosmic microwave background (CMB) as observed by the European Space Agency's Planck space observatory. Among the discoveries: The universe is older than ...