# Tag Info

Accepted

### Is there a better explanation of this picture showing the very distant star "Earendel"?

I did the annotation of that figure for the press release, so let me start by apologizing for the poor explanation, and then try to dig deeper into what's going on :) (although you already seem to ...
• 32.2k
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### Local neighbourhood and Superclusters

Structure formation Structure in the Universe — galaxies, galaxy groups, clusters, and superclusters — forms from regions of the Universe which are denser than the average; dense enough the overcome ...
• 32.2k

### How do astronomers know that distant galaxies aren't actually nearby star clusters?

Other answers have provided general ideas about how to confirm that individual sources are distant galaxies and not clusters, so I'll focus on the question of how astronomers in the Dark Energy Survey ...
• 14.7k
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### Why does the Bullet Cluster have many names?

Most astronomical sources don't have a poetic name such as the Bullet Cluster. Such names are usually coined for objects that may have a particular interest to the public (or the astronomical ...
• 32.2k
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### Is the Hubble Ultra-Deep Field image representative of the entire sky?

Short answer: both. HUDF is representative on the type of galaxies we can find at that distance (and remember that distance also means time ago). On the other hand, we do not really know how the ...
• 4,488
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• 1,453
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### Are 3D coordinate data from Sloan DSS-III available & easily accessible to non-pros?

BTW if anyone wants a quick and fast query to solution do the following: Go to https://skyserver.sdss.org/dr12/en/tools/search/sql.aspx. Paste a query like this: ...
• 306