The gravitational binding energy of the Milky Way?

In summary, the conversation discusses the concept of gravitational binding energy and its application to galaxies. It is defined as the energy required to liberate all particles of a body beyond the ability of gravity to pull them back together. The amount of energy needed to "blow up" a galaxy would depend on the mass of the galaxy and the distance of each particle from its center.
  • #1
Researcher X
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0
Does this even make sense? Just how immense would that be?
 
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  • #2
What do you mean by "gravitational binding energy"?
 
  • #3
That concept doesn't make sense in the case of a galaxy? It's the amount of energy needed to liberate all the particles of a body beyond the ability of gravity to pull them back together.

Basically, how much energy would it take to "blow it up" or pick it apart piece by piece.
 
  • #4
Gravitational binding energy of a galaxy is simply the energy needed to move each particle (star) in it to infinity - is equivalent of escape velocity.

For each small element of radius simply find the mass inside that radius, then the gravitational potential energy of a star at that radius is just = G m_star m_galaxy /R
You have to then recalculate the remaining mass of the galaxy at each step
 

1. What is the gravitational binding energy of the Milky Way?

The gravitational binding energy of the Milky Way refers to the amount of energy needed to completely disperse or break apart the galaxy, overcoming the gravitational forces that hold it together. It is estimated to be around 1.2 x 10^56 joules.

2. How is the gravitational binding energy of the Milky Way calculated?

The gravitational binding energy of the Milky Way is calculated by taking into account the total mass of the galaxy, its size, and the distribution of that mass. This calculation is based on the laws of gravity and is commonly used in astrophysics to determine the stability of a celestial object.

3. What factors contribute to the gravitational binding energy of the Milky Way?

The main factors that contribute to the gravitational binding energy of the Milky Way are its mass, size, and the distribution of that mass. The more massive and larger a galaxy is, the higher its binding energy will be. Additionally, the distribution of mass within the galaxy also plays a role, as a more concentrated mass distribution will result in a higher binding energy.

4. How does the gravitational binding energy of the Milky Way affect the galaxy?

The gravitational binding energy of the Milky Way is crucial in maintaining the stability of the galaxy. It is what keeps the stars, gas, and dust within the galaxy from dispersing into space. Without this binding energy, the Milky Way would not be able to maintain its shape and structure, and could potentially break apart.

5. Can the gravitational binding energy of the Milky Way change over time?

Yes, the gravitational binding energy of the Milky Way can change over time. As the galaxy evolves, the distribution of mass within it can change, affecting its binding energy. Additionally, interactions with other galaxies or the presence of dark matter can also impact the gravitational binding energy of the Milky Way.

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