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Free Wallpapers Sky, Galaxies & Space Page 6
All free wallpaper images of space, galaxies, the solar system, stars, planets including Hubble Telescope and NASA pictures. See both Space Wallpaper categories below for all image downloads.

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Free Wallpaper Images - The Sky, Galaxies and Space    

Sky, Galaxies & Space Wallpaper Downloads - Viewing Page 6
Huge selection of high resolution desktop wallpapers from NASA, the Hubble Telescope and other invaluable sources. Our night sky, the nine planets in our solar system, the earth, sun, mars, jupiter, venus, uranus, pluto, saturn, mercury, stars, star births, star formaions, distant galaxies, nebula (nebulae) and many more stunningly beautiful pictures of our solar system and beyond. Find high quality wallpaper pictures for your computer desktop and download free.

How to Download Your Free Computer Wallpapers
Right-click on a wallpaper preview pane and choose 'Save Picture As' or 'Save Image As' to save it on your computer in full size. To preview any wallpaper image at full size, click on a wallpaper preview picture or the link describing the wallpaper. All wallpaper images are minimum 1024 x 768 for great viewing on any desktop.

Index of Free Space Wallpaper Downloads





Sky, Outer Space, Galaxies, Solar System, Space, Planets and Stars
Sky, Galaxies & Space    Planets, Stars & Solar System


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Stars Galaxies Space Planets Wallpapers
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Sky, Space and Planets Computer Desktop Wallpaper
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High Resolution Space Photography Wallpapers
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NASA Pictures Wallpapers Downloads
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Sky, Space & Planets Computer Desktop Wallpaper
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Stars Galaxies Space Planets Wallpapers
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Free Computer Wallpapers Hubble Telescope
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NASA Pictures Wallpapers Downloads
Sky, Galaxies & Space
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Wallpapers - Galaxies, Stars, Solar System, Planets


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Index of Free Wallpaper Downloads





Sky, Outer Space, Galaxies, Solar System, Space, Planets and Stars
Sky, Galaxies & Space    Planets, Stars & Solar System





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The Formation of Stars - How a Star is Born

How It All Begins - How Stars are Formed
The Milky Way Galaxy is filled with clouds of gas and dust. A small telescope resolves these clouds as either black regions on the sky where background stars are blocked out or as glowing nebula in the case of those clouds that are illuminated by very bright stars. Interstellar dust clouds have two components: gas (which is mostly hydrogen), and dust, composed of tiny grains the size of smoke particles. The gas fills most of the volume of the cloud but the dust is what makes them opaque.

These clouds are the birth place of stars and the material in them is the raw material from which stars are made. Since the clouds are mostly hydrogen, with some helium and trace amounts of other elements, hydrogen is what newly formed stars are principally composed of. Clouds also contains small amounts of the element lithium which is destroyed very quickly in stars which have begun nuclear fusion. This makes lithium a good indicator of stellar youth. If it is still present the star is not yet old enough to have significant amounts of fusion taking place.

Collapse in the Sky - A Protostar Forms
The formation of a star begins with a collapse. Perhaps a supernova shockwave or the wind from a massive star triggers it off, but once it starts the collapse proceeds until something stops it. When a clump of material in the cloud begins to contract, the first stage of stellar life begins. As the particles in the clump get closer together the force of gravity between them increases. This in turn makes the star contract faster, pulling the particles closer together still, thus increasing gravity's pull further. A feedback loop is produced creating a self sustaining gravitational contraction.

At this stage the star is only a few tens of thousands of years old. Most of the material that will eventually make up the star is still quite far from the core and is very cool (10's of degrees Kelvin), producing emission only at millimeter wavelengths. This phase is called infrared Class 0.


Part 1   Part 2   Part 3

 Star Formation in the Eable Nebula (Hubble Space Telescope)

The Hubble Space Telescope captures a star formation in the Eagle Nebula



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