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Please explain.do they move.Somewhere on the net it said the galaxy moves!whats this?

2007-05-04 00:13:05 · 12 answers · asked by fantasy 1 in Science & Mathematics Astronomy & Space

12 answers

Nothing is at absolute rest...even the spacetime fabric of the universe is expanding.
Everything moves in a straight line through curved spacetime.
Everything in motion remains in that state of motion unless acted upon by some external force.
So, the earth moves along in a straight line around the curved spacetime caused by the Sun's gravity well.
The Sun, which is located about 3/4 the way out from the center of the Milky Way along one of the spiral arms, moves along as the galaxy as a whole rotates around its center.
The Milky Way is moving around or orbiting a central point amongst the galaxies of what is called [by astronomers] the "Local Group".
To somewhat visualize this, imagine cars on a race track along moving at different speeds. Sometimes they all seem to line up from one observer's viewpoint while to another observer they all appear strung out or staggered apart. Eventually, a car going really fast compared to the others will be part of the group of the others and at other occasions it will be elsewhere on the track by itself, but they're all still going around a central point.

2007-05-04 02:44:20 · answer #1 · answered by quntmphys238 6 · 0 0

Yes the stars are moving, that is the easy part of the answer.

The stars within our galaxy are actually moving in more than one way. first our planet is part of a spiral galaxy and all the stars in the Galaxy orbit around the center of the galaxy. Kind of like the planets of our solar system orbiting around our sun.

Second, at least at present the universe is expanding. And with few exception the galaxies within the universe are moving away from each other.

And Thirdly, The Galaxies as they move away from each other also orbit around the center of the Universe.

The last way that I am aware of that stars move is that that the have spin and wobble. Like the earth the stars rotate (spin) about a center axis. This spin is not sooth but has a wobble affect. That is to say the axis that it spins on shifts position a few degrease and back again over time.

2007-05-04 00:37:15 · answer #2 · answered by Anonymous · 0 0

That is the theory, and it seems to be pretty well supported. The Stars and Galaxies and all other matter are still moving outward from the center of the universe from the time of the big bang. They are also accelerating the last I heard, I believe the simple theory is because dark matter is having an effect and creating a force on regular matter.

As for the stars in individual galaxies, they all rotate around the galaxtic center. It is a simple law of physics that in order to hold the objects and keep them from flying off those objects need to be moving around a center.

Now, this is an incredibly simplistic explanation of how things work, but yes they are in motion.

2007-05-04 00:20:53 · answer #3 · answered by Josh T 4 · 0 0

The universe is a very big place. Galaxies DO move. Stars DO move within the galaxies. Do not get the idea that everything is very orderly up there. It is not. There has also been instances stars colliding with other stars. Likewise, meteors also move about space. When they hit a planet, they form a hole on the ground call crater.

2007-05-04 00:19:52 · answer #4 · answered by GeorgeRock 2 · 0 0

Yes, stars move. Galaxies too. They are in space, not attached to anything solid. There is nothing holding them in place. Think of it as a bunch of balloons floating in the air with nothing to hold them in place. But since there is no air in space, they are not so much floating as falling, kind of. That is to say, they are weightless, like the astronauts in orbit. They can be moving really fast, like a million miles an hour, but since they are all trillions of miles away, or even quadrillions of miles away, they seem to creep very slowly across the sky, like an airliner flying high over you at 600 miles per hour looks like it is going slowly. The stars move so slowly compared to the vast distances of space that it would take hundreds of years for them to move far enough for people without telescopes to notice that they were not in the same place any more.

2007-05-04 02:07:48 · answer #5 · answered by campbelp2002 7 · 0 0

Stars make up galaxies and they move around the center.
The outer arms of the galaxy are made up of solar systems,which are satellite systems.
The arms are not satellite systems,they rotate locked in step with the galactic center.
Then the galaxies themselves move in relation to each other.

2007-05-05 02:00:34 · answer #6 · answered by Billy Butthead 7 · 0 0

All stars move, all stars have what we call in astronomy 'proper motion'. But because they are so far away from us we cannot observe that real motion with our naked eyes in the way we observe the planets changing position each night in the sky.

2007-05-04 15:14:16 · answer #7 · answered by stardom65 3 · 0 0

all the galaxies are moving away from each other, think that they were all together and then the big Bang came.

Plus the gravity forces

2007-05-04 00:16:37 · answer #8 · answered by thpa 2 · 0 0

Both stars and galaxies move (some move REALLY fast). They just look stationary to us because they're so far away.

2007-05-04 00:36:52 · answer #9 · answered by Skepticat 6 · 0 0

Everything is in motion in the universe. the universe is still expanding which means everything is still in motion. But at the distances we are talking about even to the nearest star, the motion is barely detectable, and is not detectable to the human eye.

2007-05-04 00:17:32 · answer #10 · answered by Brian K² 6 · 1 0

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