The highs and lows of away goals are forever gone.
The away goals rule is a method of tiebreaking in association football and other sports when teams play each other twice, once at each team's home ground. Under the away goals rule, if the total goals scored by each team are equal, the team that has scored more goals "away from home" wins.
The UEFA Champions League is an annual club football competition organised by the Union of European Football Associations and contested by top-division European clubs, deciding the competition winners through a round robin group stage to qualify for a double-legged knockout format, and a single leg final.
The Union of European Football Associations is the administrative body for football, futsal and beach soccer in Europe, as well as Asia's Israel and the Euroasian transcontinental countries of Russia, Turkey, Cyprus, Azerbaijan, Armenia, Georgia, and Kazakhstan.
Steffen Prößdorf, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons