Uncovering the History of Galaxies

In visible light images, more than a thousand galaxies seen in the volume that is not true because only a fraction is seen clearly at a distance of about 20 million light-years away in the Coma Galaxy Cluster. But the infrared image of the Coma Cluster is now used to add thousands more to calculate the Coma galaxy in the form of dwarf galaxies that were previously undiscovered.

This composite combines infrared Spitzer Space Telescope image data (red and green) with visible light Sloan Sky Survey Data (blue) to the center of the cluster. More than 1 degree wide, the field is dominated by two giant elliptical galaxies in blue. However, many small green stain identified as dwarf galaxies, roughly comparable to the Small Magellanic Cloud. dwarf galaxies are expected to form first and then become the building blocks for larger galaxies. Coma Cluster can currently have arrested 320 million light-years wide.

More than 12 billion years of cosmic history is displayed in the view, full-color panorama of thousands of galaxies.

This image, taken by NASA's Hubble Space Telescope, was made from mosaics taken in September and October 2009 with the Wide Field Camera 3 newly installed, and in 2004 with the Advanced Camera for Surveys and covers most of the southern areas of large galaxy census called the Great Observatories Origins Deep Survey, a study that explore space with several observatories to trace the evolution of galaxies.

The image shows the galaxy shapes that appear increasingly chaotic at each earlier age, galaxies grew through accretion, collisions and mergers, which range from the mature spirals and ellipticals in the foreground of irregular galaxies, which mostly have a considerable distance to be caught by the infrared camera the galaxies are considered the building blocks smaller galaxies larger we see today.

The picture shows thousands of galaxies over most of the history of the universe. Closest galaxies seen in the foreground emitted light observed formed about one billion years ago. The farthest galaxies, a few red spots are very faint, they appeared more than 13 billion years ago, or about 650 million years after the Big Bang. This mosaic spans a slice of space that is equal to about one-third of the diameter of the full moon.