To run the application, locate the server folder, and open command line, run
npm i
after which you should be able to start the service by typing
npm run start
and navigating your browser to the location mentioned in the console.
The application uses NASA's record of near earth objects from December 19th to December 26th 2016, and determines based on the data the nearest missing object (asteroid) during that time.
The application shows basic characteristics of the object, along with how near miss it was on a scale of Earth to Sun, with Earth being on the bottom of the page and Sun being on the top.
As an easter egg, you can also see other near earth objects that occurred during 2015 Christmas week by clicking on the Sun. This will give you a random asteroid from the application store. If you want to see the default nearest miss object again, just click Earth.