SN IIP

SN IIP, or Type IIP supernova, is a kind of stellar explosion that occurs when a massive star has exhausted its fuel and its core collapses. This causes the outer layers to rapidly expand and then gradually fall back, producing a characteristic light curve with a plateau stage where brightness remains steady for about 100 days. This "plateau" results from the recombination of hydrogen in the ejected material. SN IIP supernovae are important because they help us understand stellar evolution and serve as distance indicators in the universe.