I found an answer from science.nasa.gov

How did we get here? | Science Mission Directorate

A basic question astronomers must address is, how did the universe create its first stars and galaxies? Once these entities were created, how did they influence  ...

For more information, see How did we get here? | Science Mission Directorate

I found an answer from www.quora.com

How did the universe start if something came from nothing? - Quora

With all due respect, anyone who tries to explain the birth of the universe, the birth of reality as we know it, is wrong. Dont get me wrong here, I am not calling ...

For more information, see How did the universe start if something came from nothing? - Quora

I found an answer from science.howstuffworks.com

How did the universe begin? | HowStuffWorks

The universe and how it began is explained in this article from HowStuffWorks. Learn about the origins of the universe.

For more information, see How did the universe begin? | HowStuffWorks

I found an answer from en.wikipedia.org

Universe - Wikipedia

The Universe is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy. While the spatial size of the entire Universe is unknown, it is possible to measure the observable universe. The earliest scientific models of the Universe were developed by ancient ..... This marked the end of the radiation-dominated era and the start of the ...

For more information, see Universe - Wikipedia

I found an answer from en.wikipedia.org

Big Bang - Wikipedia

The Big Bang theory is the prevailing cosmological model for the observable universe from the ... Physicists are undecided whether this means the universe began from a .... Despite being extremely dense at this time—far denser than is usually required to form a black hole—the universe did not re-collapse into a black hole.

For more information, see Big Bang - Wikipedia

I found an answer from physics.stanford.edu

"How Did the Universe Begin, and How Will We Know?" | Physics ...

The first discussion in the Current Topics in the Natural Sciences series will be hosted by the Physics Dept. This discussion, entitled "How Did the Universe ...

For more information, see "How Did the Universe Begin, and How Will We Know?" | Physics ...

I found an answer from www.quora.com

How did the universe begin, and how will it end? - Quora

If we extrapolate our observations and theories about cosmology, it seems like it will never end in the classical sense. Anyway, at some point expansion will ...

For more information, see How did the universe begin, and how will it end? - Quora

I found an answer from www.nasa.gov

NASA - Brief History of the Universe

Dec 18, 2006 ... Our universe began in a tremendous explosion known as the Big Bang ... providing strong evidence that our universe did blast into existence.

For more information, see NASA - Brief History of the Universe

I found an answer from spaceplace.nasa.gov

What is the Big Bang? | NASA Space Place – NASA Science for Kids

The farthest galaxies were moving faster than the ones close to us. ... When the universe began, it was just hot, tiny particles mixed with light and energy.

For more information, see What is the Big Bang? | NASA Space Place – NASA Science for Kids

I found an answer from neuroscience.stanford.edu

Current Topics in the Natural Sciences - How did the universe begin ...

Dec 2, 2014 ... A new series of discussions sponsored by the Deans Office of the School of Humanities and Sciences "Current Topics in the Natural Sciences"

For more information, see Current Topics in the Natural Sciences - How did the universe begin ...

I found an answer from sports.yahoo.com

How Did the Universe Begin? Not With a Big Bang, Says Physicist ...

Nov 28, 2017 ... The group's cosmology or model of how the universe began outlines a “bouncing cosmology.” You can think of this, according to Yahoo News ...

For more information, see How Did the Universe Begin? Not With a Big Bang, Says Physicist ...

I found an answer from wmap.gsfc.nasa.gov

WMAP- Life in the Universe

Feb 26, 2016 ... How did the universe start and evolve? WMAP found that the universe is 13.7 billion years old. The universe began with an unimaginably ...

For more information, see WMAP- Life in the Universe

According to the Big Bang theory ( not to be confused with the popular sitcom!) the universe as we know it started with a small singularity, then inflated over the next 13.8 billion years to the cosmos that we know today.

Because current instruments don't allow astronomers to peer back at the universe's birth, much of what we understand about the Big Bang Theory comes from mathematical formulas and models.

Here is an interesting article to read

https://www.space.com/24781-big-bang-theory-alternatives-infographic.html

https://www.livescience.com/1774-greatest-mysteries-universe.html