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Other galaxies were first believed to be?
Nebulae or star clusters within the Milky Way Galaxy.
What are the structures in space from smallest to largest?
From smallest to largest, the structures in space are: planets, stars, star clusters, galaxies, galaxy clusters, and superclusters. Within each of these categories, there is a wide range of sizes and variations.
Since the universe is thought to be expanding why do galaxies collide?
Because although the universe is expanding, the galaxies within it are grouped into clusters. These clusters are still under the influence of gravity, so slowly, over many years, they are attracted towards each other and can collide with one another.
Is the space expanding within clusters of galaxies?
Oh, isn't that a lovely question? Imagine the vastness of space where galaxies swim like little fishies in a giant cosmic pond. Just like those gentle galaxies are drifting apart and getting more glimmery over many seasons, the space between them is gently unfurling, creating more room for poems and rainbows along the way. Everything in the universe plays its part in the Great Artist's masterpiece. 
Do all galaxies have planets in?
No, not all galaxies have planets. Planets are found within individual galaxies, such as our Milky Way galaxy, but there are many galaxies in the universe where planets may or may not exist.
What pairs of objects are the farthest apart?
The pair of objects that are the farthest apart in the universe are galaxies. Galaxies are clusters of billions of stars and are separated by vast distances in the universe. The observable universe is about 93 billion light-years in diameter, so galaxies within it can be incredibly far apart.
How do sun clusters contribute to the formation and evolution of galaxies in the universe?
Sun clusters, also known as star clusters, play a crucial role in the formation and evolution of galaxies in the universe. They are the building blocks of galaxies, as they contain a large number of stars that are formed from the same gas cloud. These clusters help in shaping the structure of galaxies by influencing their dynamics and distribution of stars. Additionally, interactions between star clusters and galaxies can trigger the formation of new stars and affect the overall evolution of the galaxy.
Do stars form into galaxies?
Galaxies are vast collections of stars. So I guess you could say that a big group of stars forms a galaxy. Our galaxy has many big clusters of stars within it, so not all star clusters are galaxies. If you have a cluster of several million or billion (or trillion) stars surrounded by a lot of empty space, that is probably a galaxy.
What percentage of carbon dioxide is on venus?
In order to answer that question it is necessary to know how much carbon dioxide there is on Venus and how much is in the whole universe. Whereas the former can be estimated, there is little hope of estimating the latter to any degree of accuracy. However, based on the estimated number of galaxy clusters, and galaxies within those clusters, and stars within those galaxies with planetary systems, it is likely that the percentage of universal carbon dioxide that is on Venus is as close to 0% as makes no difference.
What is a Supernova clusters?
Supernova clusters are regions within galaxies where multiple supernova explosions have occurred relatively close to each other in space and time. These clusters provide valuable insights into the life cycle of massive stars and the impact of supernova explosions on their surrounding environment. A well-known example is the Cygnus Loop in the constellation Cygnus, which is a supernova remnant created by a cluster of supernova explosions.
What role does gravity play in forming galaxies?
Gravity is the force responsible for bringing together gas, dust, and stars within galaxies. It acts to pull these materials closer together, leading to the formation of structures like galaxy clusters and superclusters. Gravity also influences the movements of objects within galaxies, such as stars orbiting around a galactic center.
In order of size starting with largest star cluster galaxy universe star planet?
Universe, galaxy, star cluster, star, planet. The universe encompasses all galaxies, with galaxies containing star clusters, which consist of stars. Planets revolve around stars within galaxies.
