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Galaxies (other than our own) are very far away, and it takes light a long time to reach us from those galaxies. In some cases it takes billions of years, in which case what we are actually seeing is the way that galaxy looked billions of years ago, rather than what it looks like in the present time.
What else can I help you with?
Why are elliptical galaxies redder than disk galaxies?
Actually, it doesn't matter what kind of galaxy it is, because it depends on what kind of stars are in it. If a galaxy has a lot of red giants, it will appear redder than a galaxy with mostly blue-white stars. Older galaxies might be redder than younger galaxies due to the fact that older stars appear redder.
Why do the furthest galaxies appear less ordered and less organized than those you see near the milky way?
The further away they are, the further back in time you see them. Such distant galaxies are much younger than ours, which is also evidenced via their chemical evolution.
What are similarities between elliptical and spiral galaxies?
While spiral galaxies are bright, elliptical galaxies are dim. 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 are facts about spiral galaxies?
milky way is a spiral galaxy spiral galaxies have younger stars in the arm and older stars in the middle
What color do elliptical galaxies tend to be and why?
Elliptical galaxies tend to be reddish in color because they are made up of older stars that emit more red light. These galaxies have used up most of their gas and dust, resulting in a lack of ongoing star formation. This makes their overall color appear reddish compared to younger, bluer galaxies.
How are galaxies influenced by their surroundings?
About the only thing that can surround galaxies is other galaxies. Since many galaxies appear to lie in approximate lines, one thing that influences galaxy formation may be "superstrings," but these have yet to be directly detected.
Along with shape and size which property distinguishes spiral galaxies elliptical galaxies and irregular galaxies from one another?
You can also distinguish them by the types of stars - older stars versus younger stars, and stars of different "metallicity".
Spiral galaxies often appear bluish due to an abundance of what?
young stars
Spiral galaxies often appear bluish due to an abundance of?
young stars.
How would the spectra from galaxies appear?
They have broad emission lines of highly ionized elements.
How would other galaxies appear to move relative to Earth if the universe were shrinking?
If the Universe was shrinking the galaxies would appear to be moving towards the Earth, and look more blue than they should. This is the opposite to the universe expanding where galaxies would appear to be moving away from the Earth, which we know due to "red shift". Andromeda would be the exception since it's directly moving towards the Milky Way.
Why are far distant galaxies not visibly younger and less well formed than nearer ones?
They actually are. Galaxies that are only millions of light years won't show much difference - that's too short compared to the age of galaxies. But there is definitely a trend in galaxies at distances of billions of light-years. Their metallicity is lower (i.e. they have had fewer supernovas to pollute the interstellar gas), and there is a greater percentage of disc galaxies (elliptical galaxies are thought to form by the collision of disc galaxies).
