how do galaxies form part of the universe?

Question

please explain in detail

Answer 1

Well, it's the same way that grains of sand, or pebbles, form part of a beach.

The Universe is *everything* - both the galaxies, and the space between them.

A galaxy is a collection of stars, held together by gravity. A bit like a huge solar system (though not always with just one centre).

So planets orbit stars (this is a solar system). These stars are collected together into galaxies. Galaxies gather together into Clusters. Clusters form Superclusters.

And all of these things are spread across the Universe.

Answer 2

How I understand it is galaxies contain the vast majority of the matter in the universe. They orbit around a central point. They contain stars (like our sun) which can be orbited by planets and other satelittes suchas commits and meteors. Galaxies also contain dark matter. Dark matter is what scientists basically use to make there calculations for the way that galaxies rotate work. If there was only the matter we could see then then there would not be a large enough gravitational field to hold galaxies together and they would fall apart. So scientist have predicted something called dark matter which we can't see but has a mass and basically holds the galaxies together.

Since the universe is expanding all the galaxies are moving in relation to each other, in the vast emptness of space. Generally they are moving away from each other but occasionally galaxies can collide.

Hope that answers you question!

Answer 3

A detailed answer would not be possible as it would require a PhD in Astro-Physics.

One point to remember though - most of the matter in the universe is now thought to be "dark matter" mainly in the "empty space" between the galaxies.

So galaxies are the bit of the universe we can see and form as a result of gravity pulling stuff together. Stars light up because of the massive pressures starting nuclear reactions in their core.

Answer 4

Hello,

(ANS) Galaxies are a commonly found phenomena in our cosmos, they form as a result of catastrophic explosions called supernova. Supernova are rare events but take place when a star (just like our own sun) finally runs out of its nuclear fuel and so implodes in upon itself and then finally explodes. On an unimaginable scale, the explosion is so powerful they can sometimes even be seen from the earth with the naked eye. Even though the light from such events has traveled millions of miles to reach us.

Galaxies form from all the gases, dust, rock and other material debris left over from the supernova. This material forms into dust & gas clouds which eventually become the birthing ground for the formation of new stars and planets. The time scales involved are mind bogglingly vast, we are talking billions of years here.

Once a new star or stars are formed, this tends to have an impact on gravity and so many objects including the galaxies themselves end up rotating or spinning.

**I'm only talking about the commonest types of galaxies which we know about, those that we can study and can see with our powerful instruments and earth based telescopes. But the cosmos is also made up of huge amounts of dark matter and possibly dark galaxies or star systems which we don't understand at all as yet.

**Galaxies are one of the most common phenomena in our understanding of space and time, just like mountains & hills are to our understanding of the physical landscapes we live in.

**But there remain a incredibly vast amounts of objects we have little or no idea about, or have yet to discover in the cosmos.

Ivan

Answer 5

Stars and galaxies are continuously being fashioned using celebs and their existence cycle. reckoning on the dimensions of the famous guy or woman, while it dies (i.e. runs out of all fusible components at this is middle) the two all of it's outer layers fade out right into a planetary nebula, the place gravity could clump those components jointly to create new celestial gadgets, or it may explode in a supernova, and blast this is components some distance away. this is considerable to endure in innovations that stars are made from Hydrogen and Helium; all the different components come from Nuclear Fusion the two at this is middle or at this is outer layers (in simple terms applies to giant stars exploding in a supernova), and because those are the two could considerable components interior the universe (Hydrogen is the main, using fact this is the lightest, observed by making use of Helium) then stars will save on forming for terribly lengthy time. The universe can create rely (nuclear fusion) and power (nuclear fusion to boot, rely is switched over to power, E=mc^2 facilitates it) yet, it rather isn't what fills the void between celestial gadgets. using fact area is seen a vacuum, there is rather little rely in between celestial gadgets (and those small debris are unfold aside too). enlargement is barely the theory the galaxies are shifting extra aside; no new rely or power is created in this procedure. Will new stars and galaxies continuously be forming? No, there'll come a time while the universe runs out of Hydrogen, then Helium, the two components of which stars are composed of. yet this might by no skill be till billions of years into the destiny.

Answer 6

According to Big Bang Theory, the universe contains billions of galaxies, all moving apart at high speeds. It's a bit like imagining that the universe is a balloon- the elastic is space-time, and you can draw dots onto the balloon as galaxies. When the balloon is blown up, the space-time expands, so that the galaxies move apart from each other.

I'm not sure that that's very clear, but I hope it helps.

Answer 7

between the 2 ends of universe, to be more precise to the extent our knowledge goes, there are millions of galaxies and millions and millions of stellar objects are yet yo be studied, we have seen the tip of the iceberg. Even our solar system itself is a tiny dot in the entire universe so it is not only our universe but also many more objects are part of our universe

Answer 8

First the black hole in the middle as it furnishes the gravity well that holds every thing else in orbit. This gravity well may be 100 light years across.

Answer 9

they contain the visable matter in the universe as we know it, without them it would just be empty space.

Answer 10

By definition.