Which of the following statements correctly describes what causes a type 1a supernova?
Which of the following binary star systems could eventually lead to a type 1a supernova?
IK Pegasi is the nearest star to Earth that is a candidate for a type 1a supernova. The star is 46 pc away. If the star were to become a supernova next week, what would its peak apparent magnitude be on Earth? Give your answer to 2 significant figures.