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What is pulling the universe apart?
The expansion of the universe is causing galaxies to move away from each other, with space itself expanding between them. This expansion is driven by dark energy, a mysterious force that counteracts the gravitational pull of matter in the universe.
If universe is expanding but mass of sun and planets is not then shouldn't gravity be reduced due to space-time and mass relation?
The answer is that the expansion of the universe is only noticeable over distances of hundreds of millions of light years or more. Over the much smaller distances found within galaxies and planetary systems its effects are negligible.
How the size of the universe changed not the size or mass of the earth JUST the universe?
The Universe is continuously expanding. The distance between galaxies increases. The amount of space in the Universe increases.
What are peculiar velocities and how do they differ from the overall motion of galaxies in the universe?
Peculiar velocities are the individual speeds at which galaxies move within the universe, separate from the overall expansion of the universe. They differ from the general motion of galaxies because they are influenced by local gravitational interactions between galaxies.
Why universe is expanding despite the gravitational forces acting between galaxies?
Gravity's strength is proportional to the distance between two objects in accordance with the "inverse law formula". For every unit distance you move away from a body with gravitational attraction, the strength decreases by a factor of 1/4th. With sufficient force (like in a rocket) you can over-power the gravitational pull and reach a distance where gravity has an infinitely small effect on you. The universe is simply expanding with great enough force that it is able to escape the force of gravity. There is speculation that this may have something to do with the presence of dark matter/energy in the universe, but this is still highly debated.
What is the best evidence the universe is still expanding?
The redshift of distant galaxies, and the fact that the degree of redshift depends on the distance between us and those galaxies. What we observe can only be explained by Hubble Expansion.
What is the relationship between the expanding universe and the distances between stars and galaxies?
This is mostly theory, Galaxies are made of billions of stars. For some reason Galaxy's hold on to their stars. We do not really understand how galaxy's can yet hold their form like this. Our math so far has trouble with making sense of this. When comparing one galaxy to another, size becomes so large words are hard to describe the distance of space. There is an an incredible amount of space between everything out there. What is the distance between galaxies, why is it there, The expanding universe is trying to explain the growing spaces between galaxies yet the galaxies appear to stay bound to themselves.
What does the universe is expanding mean?
The distance between galaxies is increasing, pretty much in all directions. This suggests that space itself is expanding. We also now know the rate of expansion is in fact increasing.
What made Hubble think the universe was expanding?
Hubble observed that galaxies were moving away from each other, indicating that the universe is expanding. He discovered a relationship between a galaxy's distance from Earth and its velocity, known as Hubble's law, providing evidence for this expansion.
Do all galaxies have gravity?
Yes, all galaxies have gravity. Gravity is a fundamental force that exists everywhere in the universe, including within and between galaxies. It is responsible for holding galaxies together, as well as determining their structure and motion.
What the difference between universe and galaxies?
A universe is a very big realm of darkness with galaxies in it. and there are billions of galaxies in the universe! One of those galaxies is our solar system, and in that solar system is our planet. There probably is even more then just one univserse. O_o Well... Galaxies are within the universe and a universe is defintly bigger then a galaxy
What is between the galaxies?
There's nothing between the galaxies. It's just other galaxies that float around the universe.
