Discussion in 'Astronomy, Exobiology, & Cosmology' started by timojin, Nov 20, 2015.
How fast does our galaxy spins ? Does it spins into the same direction ?
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A galaxy is not a single object, it is a collection of stars and solar systems, all in separate orbits -- but pretty much all orbiting in the same direction. Ours takes about 250 million years to complete an orbit.
Thank you I know a galaxy have large number of solar systems . I understand the galaxy have a black hole . So are you saying the spin of one revolution take 250 million years ?
My other question is our solar system spinning in the same direction ?
Give or take a million years or so, yes. And to put that 250 million years in perspective, the speed of solar system about the galactic center is around 250kms/sec.
Our solar system's spin axis is not aligned with the galaxy's spin axis and is inclined at about 60 degrees, and many other variations with other stars are likely. But all stars are essentially spinning in the same direction as Russ has told you.
Each star and its system of planets is somewhat influenced by other stars and their system of planets, which are all originally governed by the initial gaseous nebula from whence it collapsed.
While all are though influenced by other nearby stars and of course by the central SMBH in the direction of the galactic center and Sagittarius A.
Just for our solar system. Solar systems closer to the center orbit faster and ones further away orbit slower.
Where are we locate within the galaxy ( inside or outside of the spiral ?
The galaxy has two major spiral arms, We are in neither, but are in a minor arm (or spur) called the Orion arm/spur.
In what is sometimes called the outer suburbs or the Orion arm.
Nothing in anyway special.
We're something like a third to halfway out.
Is there a a gap in between , were there is a dark space ?
??There are other stars in between separated by distances measured in light years, with the conglomerations of stars in the galactic bulge and spiral arms, and sprinkling of stars between the spiral arms.
The spiral arms by the way are thought to be caused by what we call "density waves" analogous to a traffic jam on a H/Way.
There are also stars more sparsely observed above and below the galactic plane of the galaxies and again around the central bulge.
Find a picture of where we are in our galaxy below.
It is a nice picture . That makes me ask .How can I see the whole galaxy if I am inside in it as a small dot, The picture taken is from a great altitude . It have taken several decades for Voyager to exit the most outer planet in our solar system . So what technique is used to take such photograph ?
It isn't a photograph, it is a simulation.
I see, so directly speaking we don't know our position ,
By 'know' you mean visually see? We know our position the same way a ship at sea knows it's position, by observation and calculation.
Directly speaking, there are ways and scientific methods by which we are able to reasonably and logically calculate where we are.
No, we most certainly do know our position. Do you know where you are right now, without a satellite photo to show you?
I can tell you in what parallel and what meridian I am located and at night I have to look for the polar star for reference
Looks like others answered your question. I did want to point out that when you go to that picture you can page through many pictures. I picked that one as it clearly shows the Milkyway as a Bar Spiral which it is. For most of my life they always showed it as a regular spiral galaxy. Also before you ask, no I don't know how they determined that, but I am willing to take their word for it.
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