Does the Milky Way show evidence of past collisions?
Our Milky Way galaxy has probably collided or otherwise interacted with other galaxies during its lifetime; such interactions are common cosmic occurrences.
Are spiral galaxies bigger than elliptical?
Elliptical galaxies have a broader range in size than other types of galaxies. Spiral galaxies are hotbeds of star formation, but elliptical galaxies aren’t nearly as prolific because they contain less gas and dust, which means fewer new (and brighter) stars are born.
What if we lived in an elliptical galaxy?
If we lived in an elliptical galaxy, we would see the stars of our galaxy spread out all around the sky, not in a single band. Another clue comes when astronomers map young, bright stars and clouds of ionized hydrogen in the Milky Way’s disk.
Why do the elliptical galaxies we see now have very very very little dust in them?
Most elliptical galaxies contain very little gas and dust because they had already formed.
What type of galaxy has the most dust?
Type c spiral galaxies
Why are elliptical galaxies brightest toward the center?
Elliptical galaxies are brightest toward the center. Which best explains this observation? The center is crowded with stars, and the number of stars decreases farther out.
What galaxy type is full of gas and dust what type is not?
Elliptical galaxies contain very little gas and dust, and the gas that is present is very hot and diffuse. Consequently, there is no current star formation in elliptical galaxies. The stars in elliptical galaxies are old Population II stars.
Do irregular galaxies have gas and dust?
In general, irregular galaxies contain large amounts of gas and dust, and can exhibit a significant degree of star formation activity. The closest galaxy to the Milky Way happens to be an irregular galaxy called the Canis Major Dwarf.
Why are galaxies clustered?
Astronomers think that galaxy clusters form as clumps of dark matter and their associated galaxies are pulled together by gravity to form groups of dozens of galaxies, which in turn merge to form clusters of hundreds, even thousands of galaxies. The gas in galaxy clusters is heated as the cluster is formed.
Why was the steady state theory rejected?
The Universe is observed to be expanding, so if the density remains the same, matter must be continuously created. This radical assumption is not the reason that the Steady State model is now rejected. The Steady State model has no adjustable parameters to correct for this error, but the Big Bang does.
What is the evidence of steady state theory?
Steady-state theory, in cosmology, a view that the universe is always expanding but maintaining a constant average density, with matter being continuously created to form new stars and galaxies at the same rate that old ones become unobservable as a consequence of their increasing distance and velocity of recession.
Is the steady state theory true?
The weight of evidence against the steady-state theory has convinced most modern astronomers that it is incorrect. The steady-state theory does, however, still stand as a major intellectual achievement and as an important part of the history of the development of cosmology in the twentieth century.
What disproved the steady state theory?
The supporters of the steady state theory explained this radiation as the light from ancient stars which was absorbed by particles and emitted in all directions. This was disproved because the radiation was level in spread and density, meaning that it could not have come from multiple small sources.
What is state theory?
State-centered theory (or state-centred federalism) is a political theory which stresses the role of the government on civil society. It holds that the state itself can structure political life to some degree, but doesn’t facilitate the way power is distributed between classes and other groups at a given time.
Is the Milky Way in a galaxy cluster?
The Milky Way is part of the Local Group galaxy group (which contains more than 54 galaxies), which in turn is part of the Virgo Supercluster, which is part of the Laniakea Supercluster. The large size and low density of superclusters means that they, unlike clusters, expand with the Hubble expansion.