Are galaxies the only thing out there? And other questions

Are galaxies the only thing floating in space? Are there rogue suns or singular black holes?

Is there gas, dust or amything in between the galaxies, or anything at all or is everthing know in the universe following a galaxy around?

Are all galaxies moving through space?

Is science measuring the beginging of the universe or the beggining of light? ?

Does heat cause gravity? ?

Originally posted by Xeven
Are galaxies the only thing floating in space? Are there rogue suns or singular black holes? Is there gas, dust or amything in between the galaxies, or anything at all or is everthing know in the universe following a galaxy around?

The largest structure that is gravitationally bound in the universe is a galaxy supercluster. In a supercluster, there are many groups/clusters of galaxies, e.g local group in which our galaxy milky way is located.

During a galaxy collision some stars are thrown off from their initial location in the galaxy and then they wander around in the lonliness of the space.
Read here: hubblesite.org...

There are even "lonely galaxies" that are not part of any clusters. Read more here

Are all galaxies moving through space?

Some galaxies orbit around each other due to strong gravity if they are very close together. The space between each of the galaxies is however always increasing due to the expansion of space-time, however that does not mean that they are moving through space. In about three billion years Andromeda, our neighbor galaxy will be interacting with us since both are very close to each other and thus gravity wins over the expansion.

Is science measuring the beginging of the universe or the beggining of light?

?

The beginning of our universe was the beginning of everything including light. Many theories have been proposed for the possible beginning and evolution of our universe. Search on big-bang, inflation (chaotic), and string theory.

Does heat cause gravity?

?

Gravity arises from the bending of space-time due to a massive object. It's true backwards though, gravity can cause the generation of heat.

Most of your curious questions will be answered by visiting this website:
curious.astro.cornell.edu...


[edit on 11-9-2004 by jp1111]

Originally posted by jp1111

Does heat cause gravity?

?

Gravity arises from the bending of space-time due to a massive object. It's true backwards though, gravity can cause the generation of heat.

Theoretically, heat can be seen as momentum and therefore should also cause gravity. But the effect is probably to small to be of significance. The different directions of the momentum also cancel eachother.

Dark matter has been forgotten, without some form of dark matter galaxies (groups) would break up because gravity of visible matter wouldn't be enough to keep them in "one part".
Estimates say that dark matter makes over 90% of all matter.

Originally posted by amantine
Theoretically, heat can be seen as momentum and therefore should also cause gravity. But the effect is probably to small to be of significance. The different directions of the momentum also cancel eachother.

Thanks for correcting, amantine. I guess I forgot that heat is a form of energy and energy is proportional to mass.