Did a giant Asteroid make dinosaurs become extinct?

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There is proof that an asteroid Over 9 miles wide stuck the earth on the tip of the Yucatan peninsula, in the Gulf of Mexico. Asteroids happen every now and then today, but a big one would be the size of a basketball nowadays. A 9 mile long asteroid would change atmosphere all over the world. Massive forest fires would spread through countries, severe storms all over the world, poor air quality, ocean to ocean tidal waves, and probably the worst thing ever: It would eliminate ALL sunlight for longer than 6 months. This would surely kill 70% of all life forms. The only that would survive would be smaller animals hiding out through this destruction.