What is the energy of the Universe?

[Eren]

Hello,

So you saw the question. There are some articles that say the energy is must be 0 because the mass of matter is equal to antimatter. But also there is an article by NASA says estimated mass-energy of the universe is 4x10⁶⁹ . Which one is true?

I found the NASA file by a video but not itself. Article on 2:54.

There is a link on video connects to here(https://imagine.gsfc.nasa.gov/ask_astro/index.html). I searched on site but couldn't find it.

 

[Strange]

11 hours ago, Eren said:

Hello,So you saw the question. There are some articles that say the energy is must be 0 because the mass of matter is equal to antimatter.

That makes no sense. Matter and antimatter both have positive mass (or energy). For example, if an electron and an anti-electron (positron) annihilate you don't get zero energy, you get two photons of 522 keV.

Quote

But also there is an article by NASA says estimated mass-energy of the universe is 4x10⁶⁹

4x10⁶⁹ what?

According to Wikipedia (consistent with other sources) the mass of the observable universe is about 10⁵³ kg: https://en.wikipedia.org/wiki/Observable_universe#Mass_of_ordinary_matter

But the mass of the whole universe will be much greater. Or could be infinite.

It is also possible that the total energy of the universe is zero, because the (negative) gravitational potential energy cancels out all the other mass-energy: https://en.wikipedia.org/wiki/Zero-energy_universe

 

[Mordred]

The wiki article gives mass of ordinary matter, if you read down it specifies it doesn't include DE and DM.

 

The 4×10^69 is a common estimate for mass of observable universe. However it depends on how each article estimates total mass. I've seen estimates at 10^53 and 10^69.

example 4×10^69 given here though not a reputable site, I don't count wiki as reputable either lol

https://www.google.ca/url?sa=t&source=web&rct=j&url=http://www.physicsoftheuniverse.com/numbers.html&ved=0ahUKEwiTmNP18qbVAhVozFQKHR4MB8IQFggdMAA&usg=AFQjCNGZKsc5k_EuXuCv7VWpUZfi0317pA

 

The estimate 10^53 usually arises by using the critical density formula to estimate

Edited July 26, 2017 by Mordred