Neutral hydrogen emits at 21 cm in the radio band. Studies have shown that less than 1% of the mass of most galaxies is neutral hydrogen. This is far less than the amount of matter that needs to be there to explain the observational consequences.
Yes, the halo is a component of a spiral galaxy. It consists of a roughly spherical region surrounding the galaxy's disk, containing dark matter, globular clusters, and older stars. The halo plays a crucial role in the overall structure and dynamics of the galaxy, influencing its formation and evolution.
Traditional theory suggests that globular clusters formed early in the history of the Milky Way from collapsing gas clouds, creating dense clusters of stars that have remained relatively unchanged over time. These clusters are considered some of the oldest structures in the galaxy, dating back to the early stages of galaxy formation. The stars within globular clusters are tightly bound gravitationally, orbiting the galactic center in regions where gas and dust have mostly been depleted.
Probably not. Dark matter is not believed to concentrate well in or around masses the size of stars. But it does concentrate well around galaxies and clusters of galaxies. Most of the mass of a galaxy like ours is believed to be in a sphere of dark matter in the galaxy's spherical halo.
When the total amount of mass in a galaxy is computed, and the total amount of gravity is calculated there is a discrepancy. There appears to be more matter in the galaxy than what can be observed. Dark matter was theorized as being matter that exists but does not interact with electromagnetic radiation. Because of this, it cannot be seen. That is why it is called dark matter.
Hydrogen is a gas in normal conditions.
According to the Big Bang Theory of the formation of the universe, the first matter reacted with so-called dark matter to develop the early structure of the universe. Once there were enough neutral atoms formed (mostly hydrogen) these would have aggregated into stars and stellar clusters as interstellar gas does today. The structure of the stars would have depended on local topography and gravity, but galaxies likely would have formed after the first large clusters compressed, and took in enough matter to begin their rotation.
"The halo primarily contains individual old stars and clusters of old stars ("globular clusters"). It may be over 130,000 light years across. The halo also contains "dark matter," which is material that we cannot see but whose gravitational force can be measured." to shorten the answer - individual stars, clusters, and dark matter.
Ah, happy little galaxies floating out there in the universe, clustered together like good old friends. What holds them together is something called gravity - it's like a gentle force that pulls all those beautiful galaxies towards each other. Just imagine each galaxy hugging the next one in a cosmic embrace, creating harmony in the vastness of space.
The Andromeda galaxy contains billions of stars, gas, dust, and dark matter. It also has a supermassive black hole at its center, along with star clusters and nebulae. The galaxy is located about 2.537 million light years away from Earth.
Wherever you look, galaxies and galaxy clusters are observed to have much more mass than the sum of the known matter (stars, dust, gas, black holes). Galaxies rotate too fast for the known amount of matter, galaxies in a galaxy cluster move too fast, and gravitational lensing indicates a larger mass than the known masses.Wherever you look, galaxies and galaxy clusters are observed to have much more mass than the sum of the known matter (stars, dust, gas, black holes). Galaxies rotate too fast for the known amount of matter, galaxies in a galaxy cluster move too fast, and gravitational lensing indicates a larger mass than the known masses.Wherever you look, galaxies and galaxy clusters are observed to have much more mass than the sum of the known matter (stars, dust, gas, black holes). Galaxies rotate too fast for the known amount of matter, galaxies in a galaxy cluster move too fast, and gravitational lensing indicates a larger mass than the known masses.Wherever you look, galaxies and galaxy clusters are observed to have much more mass than the sum of the known matter (stars, dust, gas, black holes). Galaxies rotate too fast for the known amount of matter, galaxies in a galaxy cluster move too fast, and gravitational lensing indicates a larger mass than the known masses.
Hydrogen is the most common element in our galaxy.
The Andromeda galaxy contains an estimated 1 trillion stars, along with gas, dust, and dark matter. It is also home to various types of celestial objects such as supernovae, star clusters, and nebulae.
Traditional theory suggests that globular clusters formed early in the history of the Milky Way from collapsing gas clouds, creating dense clusters of stars that have remained relatively unchanged over time. These clusters are considered some of the oldest structures in the galaxy, dating back to the early stages of galaxy formation. The stars within globular clusters are tightly bound gravitationally, orbiting the galactic center in regions where gas and dust have mostly been depleted.
Probably not. Dark matter is not believed to concentrate well in or around masses the size of stars. But it does concentrate well around galaxies and clusters of galaxies. Most of the mass of a galaxy like ours is believed to be in a sphere of dark matter in the galaxy's spherical halo.
The Milky Way galaxy is a spiral galaxy with a central bulge, a disk made up of arms of gas, dust, and stars, and a halo of globular clusters. The central bulge contains older stars, while the disk is where younger stars are formed. The galaxy is surrounded by a halo of dark matter that extends beyond the visible components.
Neutral charges
Yes, galaxies like the Milky Way are part of galaxy clusters that move through the universe, but they do not orbit a single object like planets orbit a star. Instead, galaxies are influenced by the gravitational forces of other galaxies and dark matter in the universe.