The word stellar means of or relating to stars. It is also used to speak of some people (often entertainers) whose performance is brilliant -- like a bright star.
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It is the above reaction that you get when you do a stellar job in any class while under the education process. Also, you get a check plus when you work hard, and MR. DeVoe is notorious for not giving check plusses.
The reason main sequence has a limit at the lower end is because of temperature and pressure. The lower limit exists in order to exclude stellar objects that are not able to sustain hydrogen fusion.
What does mean mean
The arithmetic mean is a weighted mean where each observation is given the same weight.
the mean is an average of a set of numbers