When you inflate the balloon, the dots slowly move away from each other because the rubber stretches in the space between them. This stretching of space, which causes the distance between galaxies to increase, is what astronomers mean by the expansion of the universe..
Similarly, you may ask, how does the distance change between the dots?
A changing distance between dots indicates a changing velocity and thus an acceleration. A constant distance between dots represents a constant velocity and therefore no acceleration.
Beside above, how does the density and distribution of your stars change as the balloon expands? When the balloon expands it is because when the volume increases, the density will increase and so will the mass. Compare and contrast your experimental procedures with the Big Bang Theory.
Similarly, are the stickers moving across the balloon Why?
Stickers stuck on the surface of a balloon represent galaxies in our Universe and the balloon itself represents space. When the balloon is blown up, it simulates how space between the galaxies is thought to be expanding.
How do galaxies move in relation to each other?
Yes, galaxies do move. Galaxies rotate around their centers with the sections of the galaxy that are farther out from the galaxy's center rotating more slowly than the material closer to the center. Galaxies are also moving away from each other due to the expansion of the Universe brought on by the Big Bang.
Related Question Answers
How do we know that galaxies are moving away from us?
In 1929 the astronomer Edwin Hubble measured the velocities of a large selection of galaxies. He expected that about equal numbers would be moving toward and away from us. And the farther away a galaxy is the more space there is to stretch so the faster the galaxy appears to move away from us.Is there a center of the universe?
The center of the Universe is a concept that lacks a coherent definition in modern astronomy; according to standard cosmological theories on the shape of the universe, it has no center. Historically, different people have suggested various locations as the center of the Universe.Why the galaxies are moving away from us?
The galaxies are moving away from Earth because the fabric of space itself is expanding. While galaxies themselves are on the move — the Andromeda Galaxy and the Milky Way, for example, are on a collision course — there is an overall phenomenon of redshift happening as the universe gets bigger.Is Hubble's law true?
So to determine an object's distance, we only need to know its velocity. Most astronomers believe that Hubble's Law does, however, hold true for a large range of distances in the universe. It should be noted that, on very large scales, Einstein's theory predicts departures from a strictly linear Hubble law.How do you explain red shift?
'Red shift' is a key concept for astronomers. The term can be understood literally - the wavelength of the light is stretched, so the light is seen as 'shifted' towards the red part of the spectrum. Something similar happens to sound waves when a source of sound moves relative to an observer.What is dark energy in the universe?
Dark Energy is a hypothetical form of energy that exerts a negative, repulsive pressure, behaving like the opposite of gravity. Dark Energy makes up 72% of the total mass-energy density of the universe. The other dominant contributor is Dark Matter, and a small amount is due to atoms or baryonic matter.Why are distant galaxies moving away faster?
This means that from Earth, astronomers see that the most distant galaxies seem to be moving away much faster than those that are close by. As the distant galaxy travels away from us, the wavelength of light that it emits stretches and is "redshifted" toward the infrared part of the electromagnetic spectrum.What is the curvature of the universe?
Overall Curvature of SpaceThe density of matter and energy in the universe determines whether the universe is open, closed, or flat. If the density is equal to the critical density, then the universe has zero curvature; it is flat.What is outside the universe?
But “infinity” means that, beyond the observable universe, you won't just find more planets and stars and other forms of material…you will eventually find every possible thing.Why is space expanding?
Cosmological redshifts result from the expansion of space (and the light moving through that space) between us and a distant galaxy or quasar. Space is expanding everywhere, so the more distant an object is, the more rapidly it appears to be moving away.Is there a possibility that the galaxies will stop moving from each other?
This means that no matter what galaxy you happen to be in, all the other galaxies are moving away from you. However, the galaxies are not moving through space, they are moving in space, because space is also moving. In other words, the universe has no center; everything is moving away from everything else.How fast is the universe moving?
It covers this route at a speed of nearly 30 kilometers per second, or 67,000 miles per hour. In addition, our solar system--Earth and all--whirls around the center of our galaxy at some 220 kilometers per second, or 490,000 miles per hour.Is Earth moving through space?
Earth is screaming through space at 1.3 million mph. A simple animation by a former NASA scientist shows what that looks like. As Earth rotates on its axis, it orbits the sun, which orbits the center of the Milky Way, which itself is barreling through space.Does the sun move?
Answer: Yes, the Sun - in fact, our whole solar system - orbits around the center of the Milky Way Galaxy. We are moving at an average velocity of 828,000 km/hr. But even at that high rate, it still takes us about 230 million years to make one complete orbit around the Milky Way!When the bread doubles its size how much does the distance between any two raisins will change?
If the space between everything in the raisin bread is expanding uniformly, in the time it takes the loaf to expand so that the closer raisin is now twice as far away, the further raisin is now four times as far away (the loaf is twice as big).Do stars move?
The stars move along with fantastic speeds, but they are so far away that it takes a long time for their motion to be visible to us. You can understand this by moving your finger in front of your eyes. Even when you move it very slowly, it may appear to move faster than a speeding jet that is many miles away. 
Daniel Johnston 
