by Chris Peterson » Tue Jun 23, 2009 1:53 pm
That's like taking a picture down a long road, and saying "this image is 100 miles away": it ignores that there are things closer. The Hubble Deep Field image contains objects ranging from stars in our own galaxy to distant galaxies. The oldest galaxies visible in the image are seen when the Universe was about 2 billion years old. Most of the galaxies in the image are quite a bit newer than that.
If you notice the formation of the Galaxies and their forms, there are various types just like we see local galaxies.
Of course. And many, perhaps most of these, have a similar evolutionary history to local galaxies. The very distant galaxies in the image, however, don't look at all like local galaxies. Rather, they are distorted, irregular galaxies- probably because in the early Universe galaxy collisions and mergers were very common.
Not only that, they say there is about 10,000 galaxies in this small area, focused on for 10 days.
Calculating this to the total sky , you have over 100 billion galaxies.
To this day I cannot work out how they say it took only 500 million years to form such super dooper structures. Assuming that the age of the Universe being only 13.7 Gyrs.
It didn't take 500 million years to form 100 billion galaxies. It took billions of years. It is believed that galaxies began forming perhaps 700 million years into the age of the Universe- a process that continued for a long time. But there's no reason to think that galaxies can't form quickly. Once baryonic matter condensed inside halos of dark matter, you had huge quantities of hydrogen, which merely had to collapse into stars. Stellar formation takes a few million years at most. It would be surprising if you
didn't have massive galaxy formation in the early, much denser Universe.
[quote="harry"]http://apod.nasa.gov/apod/ap020901.html
This image is 13.2 Gyrs away.[/quote]
That's like taking a picture down a long road, and saying "this image is 100 miles away": it ignores that there are things closer. The Hubble Deep Field image contains objects ranging from stars in our own galaxy to distant galaxies. The oldest galaxies visible in the image are seen when the Universe was about 2 billion years old. Most of the galaxies in the image are quite a bit newer than that.
[quote]If you notice the formation of the Galaxies and their forms, there are various types just like we see local galaxies.[/quote]
Of course. And many, perhaps most of these, have a similar evolutionary history to local galaxies. The very distant galaxies in the image, however, don't look at all like local galaxies. Rather, they are distorted, irregular galaxies- probably because in the early Universe galaxy collisions and mergers were very common.
[quote]Not only that, they say there is about 10,000 galaxies in this small area, focused on for 10 days.
Calculating this to the total sky , you have over 100 billion galaxies.
To this day I cannot work out how they say it took only 500 million years to form such super dooper structures. Assuming that the age of the Universe being only 13.7 Gyrs.[/quote]
It didn't take 500 million years to form 100 billion galaxies. It took billions of years. It is believed that galaxies began forming perhaps 700 million years into the age of the Universe- a process that continued for a long time. But there's no reason to think that galaxies can't form quickly. Once baryonic matter condensed inside halos of dark matter, you had huge quantities of hydrogen, which merely had to collapse into stars. Stellar formation takes a few million years at most. It would be surprising if you [i]didn't[/i] have massive galaxy formation in the early, much denser Universe.