Light Years formed in the year 2009 while vocalist Pat Kennedy worked at Subway. Since then, they have released one full-length album and three EPs. In winter 2011/2012, the band went on a full US tour with Pentimento. In February 2012, they went on a European tour with Pentimento. The band embarked on a summer tour in 2012 alongside Citizen and Turnover. In the spring of 2013, the band went on a tour with Safe. In June and July, the group went on a short US tour with Mixtapes, You Blew It! and Modern Baseball. In early 2014, the band played on The 2014 Acoustic Basement Tour, hosted by Warped Tour. Between February and April, the band went on a US tour with Neck Deep and Knuckle Puck. On March 16, the band performed at South by So What?! festival. In the summer of 2014, the band performed on the 2014 Warped Tour. The band released the Temporary EP through Animal Style in 2014.
The band signed a worldwide deal with independent label Rude Records in 2015 and finished recording their second full-length album with Will Yip, which was released in the Fall of 2015. The band supported
Neck Deep and State Champs on their UK tour in February 2016. The band also supported Four Year Strong on their Spring 2016 Northeast tour along with Can't Swim.
Rock Sound described Light Years' sound as "Smashing American pop-punk that prefers to hark back to the turn of the millenium instead of running with the current crowd".