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Galaxies are made up of billions to trillions of stars.
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∙ 14y ago
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What are the observations that tell us that the universe is changing?
Mainly that galaxies that are very far away (i.e., from the distant past) look different to galaxies that are near-by (from the more recent past).
Do galaxies produce their own light?
Galaxies are made partly of stars, which produce light. So, in that sense, yes.
This cluster of galaxies is made up of about 25 galaxies including the milky way?
Yes its called the Local Cluster or Local Group, we have many minor Globular or Cluster Galaxies orbiting our own.
Why do observations made of distant galaxies indicate that dark energy exists?
The observations made from distant galaxies suggest that Dark energy exists. This is because of the fact that the galaxies are moving away from each other. This is given by Hubbles law.Instead of being attracted by the force of gravitation,galaxies tends to move away suggesting the presence of a gravity opposing force called dark energy.
What are the two important discoveries Hubble made that proved other galaxies exist outside our own?
Hubble discovered that the nebulas were galaxies based on the powerful telescope at Mt Wilson. The second discoveries was the red shift relationship v=HD shows that the galaxies were outside our own galaxies definitely and quantitatively, using light sources in galaxies that were standard sources that could calibrate the distance.
What is a galaxy made of?
Gases and stars and a massive central black hole.
The local group contains mainly spiral galaxies?
No. It has only 3 big spiral galaxies, but dozens of dwarf galaxies.
What causes the light in galaxies?
A galaxy is made up of hundreds of billions of stars (suns). The light from the galaxies comes mainly from those stars.However, in early galaxies, a much larger amount of energy was released from the quasar - currently believed to be the gigantic black hole in the center of galaxies.
What makes galaxies merge and separate?
Gravity and inertia, mainly.
In what parts of the universe do stars and planets exist?
Mainly inside of galaxies.
Why are the stars found in galaxies?
Because that is what galaxies are "made" up of.
What has all the stars and galaxies in them?
the universe is made up of galaxies
What is the universe like outside the galaxy?
There are other galaxies. Between the galaxies, there's lots of mainly empty space, with a very tenuous gas.
Are all galaxies the same size?
All galaxies are different sizes and mainly four different shapes,spiral,barred spiral,elliptical and irregular
Where the light year special units are use?
Light-years are mainly used to specify distances to other stars and galaxies, diameters of galaxies, galaxy walls, and the like.
How can you classify galaxies according to shape?
Into Elliptical and Spiral galaxy.
Are elliptical galaxies egg-shaped galaxies without spiral arms of interstellar gas and dust?
Yes, that is correct. Elliptical galaxies are characterized by their elliptical or egg-shaped appearance and lack spiral arms of interstellar gas and dust. Unlike spiral galaxies, which have a flattened disk shape with spiral arms, elliptical galaxies have a more rounded or elongated shape. They are composed mainly of older stars and contain little to no ongoing star formation. Elliptical galaxies also tend to have less interstellar gas and dust compared to spiral galaxies.
