Okay, kiddo, let me tell you about the timeline of stellar astronomy in the simplest way possible.
Thousands of years ago, people noticed the stars in the sky and created stories and myths about them.
In the 16th and 17th centuries, scientists like Galileo Galilei and Johannes Kepler started using telescopes to study the stars and discovered new things about them.
In the late 19th and early 20th centuries, astronomers like Henrietta Swan Leavitt and Annie Jump Cannon studied stars and discovered how to identify them by their brightness and temperature.
In the mid-20th century, radio telescopes were invented, and astronomers started using them to study stars that emit radio waves.
In the 1960s and 70s, scientists sent satellites into space to study stars and other celestial bodies, and this gave us even more information about stars.
Today, astronomers continue to study stars using telescopes and other technology, and they have learned about everything from how stars are born to how they die. Pretty cool, huh?