1.) A spherical supernova blast wave is observed to have an angular size of 50" and is known to be 700 PC away. What is its diameter in kilometers?
2.) The supernova blast wave in the previous question is known to have been expanding at a constant speed of 350 km/s. How many years did it take after the supernova explosion to reach its observed size?
2.) The supernova blast wave in the previous question is known to have been expanding at a constant speed of 350 km/s. How many years did it take after the supernova explosion to reach its observed size?