Marriage Equality, Star Wars: Force Awakens, Water on Mars... and Holly Holm?

As 2015 winds down, Google released their annual 'Year in Search' video. Among the numerous topics featured on the clip was the newly crowned UFC champion who recently knocked out Ronda Rousey. Watch above as the search giant runs down some of the year's biggest milestones and events that had the entire world buzzing.

"The biggest moments of 2015 inspired trillions of questions. What do they reveal about us?"

The list of those featured on the clip are as follows: