Knowing that:


The Zone of Avoidance (Looking towards the center of the Milky Way) blocks roughly 20%
Each Milky Way star has an angular size, depending on proximity, that obscures a certain percentage of our optical view.
Each Galaxy has an angular size, depending on proximity, that obscures a certain percentage of our optical view.


And so on through Galaxy Clusters, Superstructures, etc...

What percentage of our universe can we not see at visible wavelengths?


Question: Possible to remove p tags from a table cell in Wygwam
Answer: If the reason is appearance, you can remove any margin/padding formatting with css, like:
table p {padding:0; margin:0}
Or you can add specific classes to the styling menu of wygwam for tables, for a more fine grained control over styling tables.