1. What are galaxies? Why is it important to study them?
2. How are stars important to the Milky Way?
3. How has the knowledge and perception of the universe over the past century?
4. What effect does dark energy have on the universe?
5. How is matter important to the universe?
6. What do scientists believe on the fate of the universe? which theory do you feel is the better explanation of what will happen? why?
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Answers
thx bud but u didn't need to do this....
1.) Galaxies are the cluster of stars with their solar system, the know galaxies are known to rotate on an axis.
2.) As the galaxies are the cluster of stars, the stars pretty much makes up a galaxy. A galaxy contains millions of stars and these rotates around an imaginary point which is supposed to be the centre, due to the net gravitational force by many giant stars or sometimes even backholes or any celestial bodies that are big enough to provide a strong gravitational pull.
3.) The knowledge and perception of the universe have been changing over time... Earth was thought to be the center of it... but this was proved wrong... we have discovered new elementary particles which makes up the universe, we have better understanding of the workings of it, plus the universe was thought to be only a 3d entity but the new theories suggest that there should be *atleast* 12.
4.) The dark energy/matter can only be seen when there is interaction between a matter and an antimatter, as we r made up of matter and we use matter to see anyone. We don't have to worry about dark matter, as the universe is expanding, there would be almost no interaction between matter and it's anti, so antimatter's presence would not effect the universe....
5.) Matter is not particularly important to universe, we believe universe to not have a consciousness and thus it doesn't need anything... matter is important to *us* not to the universe as we r made up of matter... if all the matter is made to vanish from the universe.... universe would have no problem... but for us... yeah we would have no existence in that case XD
6.) The scientists believe on the facts and there r no facts, there r just theories!
Physicists are the people interested in theories these people think that the universe will either shrink or will keep on expanding...if the universe shrinks the internal energy will keep on increasing and the shrinking process will continue till the universe is a point object and then it'll EXPLODE again recreating big bang!
or it will keep on expanding thus the work is done by the universe and the internal energy will keep on decreasing and all the life and starts will eventually die out and freeze.... (these r the theories which I'm clear about... there are thousands of them present).
I actually think the second one seems more realistic... as the work was done by the big-bang and the universe is keeping on expanding due to that and is continue doing work and thus it's internal energy will decrease to such an extent that everything will freeze... the first one also makes sense as we can assume that the attractive forces keeps on attracting and bring every celestial body closer and merging and thus getting formed into one small body with mind boggling density and has a ginormous gravitational pull that it shrinks itself (like in a star when dying), and this process continues till the point that the unibody says I can't shrink no more then it explodes!!!!KKAAABOOMMM!
BIG-BANG
well hope this helps!
:)
HELLO DEAR FRIEND
HERE ARE THE ANSWERS ↩↩↩
1> A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction. It is important to study about galaxies because the strong gravitational pull of galaxies like the Milky Way sucks in the heavy elements that go into making up planets and people and all other non-gaseous matter in the universe.
2> Because Stars are not only a source of light and heat; they are a source of the matter from which we are created and are a major driving force of the evolution of the universe..
3> The knowledge and perception of the universe have been changing over time... Earth was thought to be the center of it... but this was proved wrong... we have discovered new elementary particles which makes up the universe, we have better understanding of the workings of it, plus the universe was thought to be only a 3d entity but the new theories suggest that there should be *atleast* 12.
4> The dark energy/matter can only be seen when there is interaction between a matter and an antimatter, as we r made up of matter and we use matter to see anyone. We don't have to worry about dark matter, as the universe is expanding, there would be almost no interaction between matter and it's anti, so antimatter's presence would not effect the universe....
5>Matter is not particularly important to universe, we believe universe to not have a consciousness and thus it doesn't need anything... matter is important to *us* not to the universe as we r made up of matter... if all the matter is made to vanish from the universe.... universe would have no problem... but for us... yeah we would have no existence in that case XD
6> The scientists believe on the facts and there r no facts, there r just theories!
Physicists are the people interested in theories these people think that the universe will either shrink or will keep on expanding...if the universe shrinks the internal energy will keep on increasing and the shrinking process will continue till the universe is a point object and then it'll EXPLODE again recreating big bang!
or it will keep on expanding thus the work is done by the universe and the internal energy will keep on decreasing and all the life and starts will eventually die out and freeze.... (these r the theories which I'm clear about... there are thousands of them present).
I actually think the second one seems more realistic... as the work was done by the big-bang and the universe is keeping on expanding due to that and is continue doing work and thus it's internal energy will decrease to such an extent that everything will freeze... the first one also makes sense as we can assume that the attractive forces keeps on attracting and bring every celestial body closer and merging and thus getting formed into one small body with mind boggling density and has a ginormous gravitational pull that it shrinks itself (like in a star when dying), and this process continues till the point that the unibody says I can't shrink no more then it
HOPE IT HELPS YOU DEAR FRIEND
THANKS