Today's Astronomy Picture of the Day is a Hubble Space Telescope view of variable star (stars, actually) R Aquarii. Hubble brings us fine detail such as this, but even a modest pair of binoculars can show the variations in brightness if you track the stars over time.
Variable stars are one area where amateurs can continue to make a contribution. There are so many to observe that there are not enough "professional scale" instruments to observe them. Amateurs have contributed observations for over one hundred years.
Might I recommend a book to you?
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