Supernovae and the science of planet formation will be discussed in February during Fiske Planetarium presentations at the University of Colorado at Boulder. "What Planets Are and How They Form" will be held Thursday, Feb. 9, and Friday, Feb. 10, while "Supernovae" will take place Thursday, Feb. 16, and Friday, Feb. 17. All presentations begin at 7:30 p.m. and admission is $6 for adults, $5 for students and $3.50 for children and seniors.