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What is a galaxy How many galaxies are there and how many stars does each galaxy hold?
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What is larger a red giant a galaxy the universe or the solar system?
The Universe may hold over a trillion (1,000,000,000,000) galaxies. A galaxy might have several billion stars. The planetary portion of the Solar System is several billion miles in diameter; no star is that big, although some red giants would reach the Earth if they were centered on the Sun.
Who found dark matter?
No one has discovered dark matter. Dark matter is a concept to explain the rotation of galaxies. We simply do not know what it is and where it is. When we looked at nearby spiral galaxies astronomers could not explain how individual stars could be moving so fast. If you add all the mass of the material we can see or infer the gravity should not be able to hold the stars in orbit. They should be streaming off. Dark matter was invented to explain this. The theory suggest that 60 to 90% of the matter in the galaxy needs to this strange dark matter.
A star is made of gas What forces hold a star together?
That is still a mystery. Obviously, they are held together by gravitation. Each star attracts each other star, and you might say that the combined force of these attractions keeps the galaxy together. But the known matter in our galaxy - and in other galaxies - isn't strong enough to account for the fast rotation a galaxy has. There must be about 5-10 times more matter, compared with known matter, in something invisible - commonly known as "dark matter". This mysterious dark matter can be noticed through its gravitational attraction, but it can't be seen directly.
How many solar system in the universes are there?
There are on the order of 100,000,000,000 (one hundred billion) galaxies in the universe, as far as current telescopes can detect. Some of these galaxies may hold up to 100,000,000,000 stars, but most galaxies probably contain at least 10,000,000,000 stars. Young galaxies under 2,000,000,000 years old may not have formed many solar systems yet, while very old galaxies more than 10,000,000,000 years old may have very few galaxies left. For the galaxies of middle age, as many as 1/4 of the stars may possess solar systems. My comment: While the answer above is true based upon current knowledge, it is essentially incorrect. The answer to your question is: ONE. Our Sun is named Sol - and the system of planets and other objects orbiting it are referred is referred to as "Solar", being of Sol. So other planetary systems exist, but they are not "Solar"... Comment: The above is incorrect, the answer above is for our known universe not the entire universe. There may be even more. The universe doesn't have a known edge, or a wall so, it's really hard to say. It would be possible to even say infinite, though scientists really hate the word infinite ;)
What other types of galaxies are there besides the milky way?
The answer is YES. There are an estimated 200 billion galaxies in the known Universe. Most of these galaxies are relatively similar to our own, some bigger, some smaller, some differently shaped. Most galaxies hold 50-200 billion stars, and average about 50,000 - 100,000 light years across. Light travels at 180,000 miles PER SECOND, so if it only takes 2 seconds to get to the moon, 30 seconds to Mars, but 100,000 light years to cross our own galaxy, imagine the size! Mind boggling!
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.
How many stars can a star gauge hold?
In Super Mario Galaxy 1 you can get 121 power stars, but in Super Mario Galaxy 2 the star gauge can hold 240 stars.
What parts hold the galaxies togher?
Galaxies are held together by the gravity, which results of their mass. It turns out that the mass of the known stars and other objects is not enough to hold galaxies together (they rotate way too fast for the known masses) - rather, much of the mass - about 80%, though it depends on the individual galaxy - is made up of an unknown substance, currently called "dark matter".
Is it true the universe is not bigger than the world?
No. Of course not. The universe is big enough to hold earth and all the other planets in the Milky Way Galaxy and all other galaxies and the sun and the moon and the stars. There is no way that the universe could be smaller that Earth. =)
What is larger a red giant a galaxy the universe or the solar system?
The Universe may hold over a trillion (1,000,000,000,000) galaxies. A galaxy might have several billion stars. The planetary portion of the Solar System is several billion miles in diameter; no star is that big, although some red giants would reach the Earth if they were centered on the Sun.
What is An example of a elliptical galaxy?
The Milky Way is about 100,000 light years in diameter (one light year is about 9.5 x 1015 meters), but only about 1000 light years thick while M10 is a globular cluster of about 100 stars, all quite similar in size, M12 is an open cluster of bright and fainter stars, more loosely packed than M10. Again about 100 stars while M14 is a fine globular cluster of many hundreds of stars and with a good Telescope can be resolved to the core, on a moonless night. No it is actually one of the largest galaxies the only other one that is larger is the Andromeda Galaxy(M31)
Who found dark matter?
No one has discovered dark matter. Dark matter is a concept to explain the rotation of galaxies. We simply do not know what it is and where it is. When we looked at nearby spiral galaxies astronomers could not explain how individual stars could be moving so fast. If you add all the mass of the material we can see or infer the gravity should not be able to hold the stars in orbit. They should be streaming off. Dark matter was invented to explain this. The theory suggest that 60 to 90% of the matter in the galaxy needs to this strange dark matter.
Subsystem of the universe?
The first subsystem would be the super cluster, or clusters of galactic groups. After that would be groups, such as our local group of galaxies. The galaxies would be the next level. Within a galaxy are numerous globular clusters of stars, and random stars (and binary and ternary pairs) orbiting the disk (for spiral galaxies). There are various types of galaxy. Each star may be orbited by zero or more planets, belts of asteroids, and/or comets, forming a solar system. Each planet may have a ring of debris and/or moons. Some of these moons may have satellites of their own, though I am not aware of any such in our solar system.
Do galaxies hold everything in space?
No. Space holds everything in space. Galaxies are held in space by space.
A star is made of gas What forces hold a star together?
That is still a mystery. Obviously, they are held together by gravitation. Each star attracts each other star, and you might say that the combined force of these attractions keeps the galaxy together. But the known matter in our galaxy - and in other galaxies - isn't strong enough to account for the fast rotation a galaxy has. There must be about 5-10 times more matter, compared with known matter, in something invisible - commonly known as "dark matter". This mysterious dark matter can be noticed through its gravitational attraction, but it can't be seen directly.
How many solar system in the universes are there?
There are on the order of 100,000,000,000 (one hundred billion) galaxies in the universe, as far as current telescopes can detect. Some of these galaxies may hold up to 100,000,000,000 stars, but most galaxies probably contain at least 10,000,000,000 stars. Young galaxies under 2,000,000,000 years old may not have formed many solar systems yet, while very old galaxies more than 10,000,000,000 years old may have very few galaxies left. For the galaxies of middle age, as many as 1/4 of the stars may possess solar systems. My comment: While the answer above is true based upon current knowledge, it is essentially incorrect. The answer to your question is: ONE. Our Sun is named Sol - and the system of planets and other objects orbiting it are referred is referred to as "Solar", being of Sol. So other planetary systems exist, but they are not "Solar"... Comment: The above is incorrect, the answer above is for our known universe not the entire universe. There may be even more. The universe doesn't have a known edge, or a wall so, it's really hard to say. It would be possible to even say infinite, though scientists really hate the word infinite ;)
What other types of galaxies are there besides the milky way?
The answer is YES. There are an estimated 200 billion galaxies in the known Universe. Most of these galaxies are relatively similar to our own, some bigger, some smaller, some differently shaped. Most galaxies hold 50-200 billion stars, and average about 50,000 - 100,000 light years across. Light travels at 180,000 miles PER SECOND, so if it only takes 2 seconds to get to the moon, 30 seconds to Mars, but 100,000 light years to cross our own galaxy, imagine the size! Mind boggling!
