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First, when stars of at least 0.4 solar masses exhaust their supply of hydrogen, their outer layers expand to form a red giant.
Evolution towards the red giant branch for the first time is very rapid while stars can spend much longer on the horizontal branch.
Most stars retain more of their hydrogen after the first red giant phase, and eventually become asymptotic giant branch stars.
This is the first ionized nebula to be have been discovered around a red giant star.
Serpentis, a cool red giant that pulsates between magnitudes 5.89 and 7.07 in 87 days.
Although many of those sources are expanding dust envelopes around red giant stars, a few are found to be associated with solar-type stars.
Sun-like stars will enter the red giant branch as subgiants.
Once a star has evolved sufficiently to become a red giant, its circumstellar habitable zone will change dramatically from its main-sequence size.
Managing Your Emotions
What makes me angry?
Mostly，l hate when someone tries to make someone else feel bad.
I have to admit that once, when l was actually called names.
l regretted doing this afterwards, but not full heartedly because l think l was provoked in that situation.
The most postive way of dealing with anger is talking about the problem.
l talk to someone who listens, or l'll write my thoughts down on paper.
Learning how to deal with anger as you're growing up is so important.
When you're younger, you might yell,or cry when you're angry, but as you get older, you're expected to handle your emotions much better.
Learning to control your emotion now will prevent you from doing something that you'll regret later on in life!
