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"Ask a Spaceman" Takes a closer look at the universe's "baby image"

This week's "Ask A Spaceman" section explores the radiation bug at Big Bang that formed our universe. While we can not see the radiation with our eyes, it surrounds us everywhere, according to Paul Sutter, astrophysicist and Space.com columnist.

"We know so well we can know things like 13.8 billion years ago, the whole observable universe was ̵

1; stay with me now – the size of a peach and had an observable temperature of just over trillion degrees," says Sutter in this this week's video, Episode 3 in his ongoing series on Facebook Watch, which is produced in partnership with Space.com. (To understand how we know the universe used to be so small, you have to watch last week's episode.)

After the great bend, the universe was extremely small, hot and tight, leading to the physics of the extremity. Atoms – the basic building blocks in molecules – could not even be formed. The common components of an atom, such as protons, neutrons and electrons, could not be attached because high radiation broke them apart, Sutter explains. Thus, the infant universe contained an overheated gas known as plasma. [The Universe: Big Bang to Now in 10 Easy Steps]

When the universe expanded, Sutter says the plasma is cooled and eventually – after 10,000 years, a fraction of the history of our universe formed – hydrogen and helium atoms. Soon the universe became transparent to the light. Nevertheless, the radiation remained in the formation of the universe.

  Astrophysician Paul Sutter participates in space physics in his new series Facebook Watch

Astrophysician Paul Sutter participates in space physics in his new Facebook series series "Ask a Spaceman."

Credit: Paul Sutter

Today, this radiation – the cosmic microwave oven – is still visible, shining in microwave wavelengths at a temperature slightly above absolutely zero, the coldest possible temperature in the universe. CMB has a temperature of 3 calves (minus 454 degrees Fahrenheit or minus 270 degrees Celsius), and it is visible everywhere in the sky.

"It is the radiation of the rays. It is fossil. It is the child's image of all of our entire universe, and this radiation surrounds us in every direction." He adds that CMB was discovered by mistake and that he will give some details in a future episode.

New episodes from the series will be released weekly on Wednesdays at 12 EDT (1600 GMT), so "like" Ask a Spaceman Facebook page or check back later to see more. Sutter is also responding to Readers' questions in each section. Click here to learn more about Pluto, Big Bang and other major subjects in the universe.

Sutter is a cosmologist at Ohio State University and chief researcher at the Columbus Ohio Center of Science and Industry. long-term podcast, also called "Ask A Spaceman." [Spacedotcom Original article on Space.com .

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