Why do astronomers suspect that a supernova explosion occurred near the nebula that gave birth to the solar system

he made 11 calls in one day

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west

i'm on my way to history not a mistory.

k2s for potassium sulphide