Deep Impact (1998)

As a comet is on a collision course with earth, humans have to prepare for their survival. They randomly select eight hundred thousand people to be saved in order to keep the human race alive.
A teenage astronomer and his teacher discover an object amongst the stars at night. Little do they know that it's a comet on a direct collision course for earth. After the teacher dies in a car crash trying to report his findings the President announces the comet's existence. He also states that there is no need to panic, because NASA is going to send astronauts on the space mission, Messiah. Their mission is to destroy the comet before it gets too close to the earth.
When Messiah backfires, the President announces that special caves will have to be built, and the government will have to have a lottery-of-fate to randomly select 800,000 ordinary American citizens to go along with 200,000 scientists, soldiers, and other officials. These 1,000,000 people will be set aside to save the population from extinction when the comet hits.
A comet is on a course to collide with Earth, and people must cope with the fact that they will die. The President has devised a plan to keep as many humans alive as possible. Scientists have built giant caves big enough to hold a million people, and the government is going to have a lottery to pick 800,000 people to live in the caves along with 200,000 scientists, artists and doctors.
A seven mile-wide asteroid is on the verge of colliding with Earth in a matter of days. But we are prepared. Think again. Scientists have begun to build several caves beneath the earth in order to prevent the extinction of the human race. At random, 800,000 people as well as 200,000 scientists and doctors are selected to stay in the caves in order to survive the "Deep Impact."