# Is Everything Made of Mass? Exploring the Universe's Mass

• MaNiFeST
In summary, there is a common misconception that all information, such as brain neurons, light, and radio waves, has mass. However, this is not entirely true as photons, which make up light and radio waves, have no mass but do have energy. The concept of space in terms of mass is better described as energy density. Additionally, while photons do have a relativistic mass when traveling at a speed greater than zero, they do not need mass to be affected by gravity as gravity is a geometrical phenomenon according to Einstein's theory of general relativity. For further discussion on this topic, it is recommended to ask in a Relativity forum.

#### MaNiFeST

Random question, but is it true that all information, like brain neurons (ideas), light, radio waves, etc... has a mass?

Basically if anything moves then it transfers energy and must have a mass. So the Universe is ALL mass?

Also, what would "space" be defined as in terms of mass.

Photons have no mass, they have energy. Light and radio waves are photons. Just because something moves, does not mean it transfers energy. Think of a a Cosmic ray traveling through a vaccum, there is nothing to transfer its energy to.

As for space, a more appropriate term would be energy density.

I like how you are thinking about such topics and I appreciate your creativity.

So what are photons and cosmic rays made up of?

Also if light gets affected by gravity, it must have a mass.
Doesn't light travel for millions of miles then starts to bend because of gravity?

Thanks

MaNiFeST said:
So what are photons and cosmic rays made up of?

Also if light gets affected by gravity, it must have a mass.
Doesn't light travel for millions of miles then starts to bend because of gravity?

Thanks

I personally don't have much information on this topic but here is what I know;

Photons do have a Relativistic Mass when traveling with a speed greater than zero.

But when it comes to waves, they don't need a mass to be effected by the gravity, According to General Relativity of Einstein gravity is curvature in space time which means a geometrical phenomena. As it doesn't involves force, the wave won't need to have a mass.

For the best answers try writing this question in Relativity forum.

## 1. What is mass?

Mass is a measure of the amount of matter in an object. It is a fundamental property of matter and is often described as the "quantity of inertia" an object possesses.

## 2. Is everything made of mass?

Yes, everything in the universe is made of mass. This includes all matter, such as atoms, molecules, and even subatomic particles like protons and neutrons.

## 3. How is mass related to gravity?

Mass and gravity are directly related. The more mass an object has, the greater its gravitational pull. This is why larger objects, like planets, have stronger gravitational forces than smaller objects, like rocks.

## 4. Can mass be created or destroyed?

According to the law of conservation of mass, mass cannot be created or destroyed. It can only be transformed from one form to another, such as through chemical reactions or nuclear reactions.

## 5. How do scientists measure the mass of objects in space?

Scientists use a variety of methods to measure the mass of objects in space, such as using gravitational forces, observing the motion of objects, and analyzing the effects of mass on light. They also use advanced instruments like telescopes and satellites to gather data and make calculations.