The world is about to end (in about 100 years) and the government knows it. How do they respond?

The government has irrefutable evidence that in 100 years, the sun will go dark. All indications are that a massive space anomaly is slowly moving towards the solar system and will block all sunlight for thousands of years. The government is convinced that once the sun goes dark, anything left on Earth will not survive. They also believe that the only hope for humanity's survival lies in space exploration. Regardless of the difficulty or cost, the goal is to get humanity out of the system before the sun is blocked and ensure the long-term survival of the species. <br><br>This knowledge becomes public at the same time as the government's plan to deal with the impending issue. What is the reaction from the public? How does the government plan on dealing with it?