At the very end when Neil deGrasse Tyson spoke about the types of of light and showed what they would look like in a cityscape until the end of the show. Name one that he did NOT mention in that segment?

Gravity is pulling an object into the sun. the closer the object gets to the sun, the greater the gravitational force that acts on the object, increasing its acceleration. a line graph plotting the speed of the object against time would have which shape? a: straight line of positive slope b: curved line that slopes upward c: curved line that slopes downward d: straight line of negative slope