A psychedelic excursion from the Rolling Stones goes up against one of Yes' most acclaimed epics when "2000 Light Years from Home" battles "Starship Trooper" in the second round of our Rock Star Wars tournament.

To try and fill our days between now and the new Star Wars: The Force Awakens movie, we’ve tracked down 32 space-themed classic rock songs and paired them off against each other in a series of intergalactic battles. The field will be halved every week based on your votes, until only the spaciest song in rock history is left.

Generally not known for indulging in spacey flights of fancy, the Stones took a bit of a detour with "2000 Light Years from Home," one of the weirder cuts from 1967's Their Satanic Majesties Request. For Yes, on the other hand, "Starship Trooper" is right in their wheelhouse — a sprawling musical trilogy whose lyrics delve into an assortment of weighty topics such as spirituality, ecology and alien life.

The Stones squeaked through the first round of the tournament, edging past Montrose's "Space Station #5" with just over 50 percent of the vote; Yes, meanwhile, made quick work of Aerosmith's "Spaced" in their battle, taking nearly 75 percent at the polls.

Now these two titans face off, and it's time to find out who will emerge victorious from this round. As always, the winner is determined purely by your votes, and you can listen to both tracks below. You can vote once per hour in each of the this round’s Rock Star Wars battles until polls close on Nov. 30 at 11:59PM ET, and your choice for our Rock Star Wars champion will be revealed on Dec. 22, 2015.

Listen to the Rolling Stones Perform '2000 Light Years from Home'

Listen to Yes Perform 'Starship Trooper'

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