Hello! Log in or register to buy tickets to the Copernicus or the Planetarium. You will find rules of return in the Regulations. Note! Your ticket is reserved only after you click "ADD TO CART". Until this time, your ticket remains available for sale and other visitors may buy it quicker than you.
You can log into one account from one device, using one window of a browser. Using multiple devices/browsers may lead to generating incorrect tickets that you will not be able to use.