Another word for galaxy is "star system" or "stellar system."
Yes, another word for satellite is "spacecraft."
Dawn.
Diffusion.
horizon?
A word meaning to work closely with someone is collaborate.
compacted
Quite nearly
Metonymy is the process of replacing one word with another, closely related word. For example, in the sentence "The orders came from the White House", it can be assumed that the orders came from the President because of the close relationship between the two words.
followed closely /under observation
Another word for closely related could be: - Connected - Akin - Alike - Complementary - Correlated - Dependent - Enmeshed - Interchangeable - Interconnected - Interdependent - Interrelated - Intertwined - Interwoven - Like - Similar
There are several: examine, study, assay, investigate.
Naming something by using a word that is closely related.
A scientist who observes bones and earth
interrogate, cross-examine, or grill
Here is a sentence that uses the word metonymy. Metonymy is a figure of speech that replaces one word for another.
Yes, it is one word, eyewitness, for a person who directly observes an event.