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Barrry said:
Where's that?
Click to expand...
It's a star cluster. It is a large group of stars held together by self-gravitation. It may contain from tens to hundreds of thousands and sometimes million stars close to each other. There are hundreds of star clusters in our galaxy Milky Way.
 
Valkiria said:
It's a star cluster. It is a large group of stars held together by self-gravitation. It may contain from tens to hundreds of thousands and sometimes million stars close to each other. There are hundreds of star clusters in our galaxy Milky Way.
Click to expand...
What really blows my mind, is that some, perhaps most of the stars we see are not stars, but galaxies. Filled with billions of stars.

Like this picture.
 

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Oldman said:
What really blows my mind, is that some, perhaps most of the stars we see are not stars, but galaxies. Filled with billions of stars.

Like this picture.
Click to expand...
You know the old Hubble Deep Field photo from 1995 that contains over 3,000 galaxies? You know how large an area of the night sky that image represents? Hold a dime at arm's length and look at Roosevelt's eye. That's the size of the area of sky seen in that image, which prior to that image was believed to be empty.

HubbleDeepField.800px.jpg
 
Because you can’t look directly at the sun, giving a big glare around, it seems bigger.
Hold an object with a 5 mm hole (1/5 inch) out at arm's length and you can see all the sun through it. But from this ‘little’ dot, 150 mill. kilometer (93 mill. miles) away, the earth receive about 1000 W/m2 (about 92 W / square feet).
 
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