At the AAS meeting, the Dark Energy Survey team announced that it had detected 11 more of these streamers , some of which have been given Aboriginal names. The Milky Way is blowing massive bubbles of extremely hot gas and energetic particles.
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These are both important marker of spiral arms in other spiral galaxies we see, so mapping them in our own galaxy can give a clue about the spiral nature of the Milky Way. There are bright enough that we can see them through the disk of our galaxy, except where the region at the center of our galaxy gets in the way.
There has been some debate over the years as to whether the Milky Way has two spiral arms or four. The latest data shows that it has four arms, as shown in the artist's illustration below. Additional clues to the spiral nature of the Milky Way come from a variety of other properties. Astronomers measure the amount of dust in the Milky Way and the dominant colors of the light we see, and they match those we find in other typical spiral galaxies.
All of this adds up to give us a picture of the Milky Way, even though we can't get outside to see the whole thing.
There are billions of other galaxies in the Universe. Only three galaxies outside our own Milky Way Galaxy can be seen without a telescope, and appear as fuzzy patches in the sky with the naked eye. The closest galaxies that we can see without a telescope are the Large and Small Magellanic Clouds. It takes around million to million years for the solar system to orbit the Sun. Another indicator of our position is where the galactic equator.
While our star system is considered to be on the outskirts of the Milky Way this is only an estimate. It is believed that the Milky Way is larger than first estimated. There is also suspicion that our galaxy is in the process of absorbing other smaller galaxies. However, there is not enough empirical evidence available to support the claim.
So what would be so important about knowing what part of the galaxy we live in? When you look at a spiral galaxy face-on, you can see beautiful spiral arms where stars are being born.
Our solar system is in the Orion arm, and we are about 25, light years 2. Schematic of the Milky way Credit: Oglethorpe University. Since our solar system lies in one of the spiral arms, we live in the flat plane of the Milky Way.
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