Hello,
As I said yesterday I try to explain in deep space little bit...
Let me start distance of Galaxies...
"Everything moving away from everything else..."
Galaxies is the most further objects in the deep space... How to calculate the distance of the Galaxies? Galaxies which are moving toward us will produce a light curve that is slightly bluer than usual, while galaxies moving away from us will be slightly redder. This phenomenon is known DOOPLER SHIFT, and specific case of object appearing redder because they are moving from us is known as "redshift".
Scientists can calculate the speed of any galaxy in this way. With the exception of a few galaxies close to our Milky Way, we find that ALL galaxies are moving away from us. The reason behind this is the overall expansion of the universe, everything moving away from everything else. In fact, faster galaxy is moving away from us, the farther away it is, For every million light years of distance a galaxy will move away from us 23 kilometres/second faster. So galaxy 10 million years distance moves away from us at speed of 230 kilometres/seconds, while a galaxy twice as fast, 460 km/second. We can use this technique to measure the distance to galaxies.
As I said yesterday I try to explain in deep space little bit...
Let me start distance of Galaxies...
"Everything moving away from everything else..."
Galaxies is the most further objects in the deep space... How to calculate the distance of the Galaxies? Galaxies which are moving toward us will produce a light curve that is slightly bluer than usual, while galaxies moving away from us will be slightly redder. This phenomenon is known DOOPLER SHIFT, and specific case of object appearing redder because they are moving from us is known as "redshift".
Scientists can calculate the speed of any galaxy in this way. With the exception of a few galaxies close to our Milky Way, we find that ALL galaxies are moving away from us. The reason behind this is the overall expansion of the universe, everything moving away from everything else. In fact, faster galaxy is moving away from us, the farther away it is, For every million light years of distance a galaxy will move away from us 23 kilometres/second faster. So galaxy 10 million years distance moves away from us at speed of 230 kilometres/seconds, while a galaxy twice as fast, 460 km/second. We can use this technique to measure the distance to galaxies.
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