Instructions: In this task, you're given a question, along with three passages, 1, 2, and 3. Your job is to determine which passage can be used to answer the question by searching for further information using terms from the passage. Indicate your choice as 1, 2, or 3.
Input: Question: How many stars are in the Milky Way Galaxy? Passage 1:Although the UKST was originally used to take photographs of the sky, traditional photographic glass (and film) became largely superseded by large electronic CCD detectors in the late 1990s, and after 2000 the UKST was used mostly for multi-object spectroscopy with the 6 degree Field (6dF) instrument. 6dF uses a robot to position up to 150 optical fibres on a metal plate mounted at the focal plane of the UKST, which then carry light from the targets to a spectrograph which sits on the floor of the dome. The 6dF Galaxy Survey (6dFGS), a redshift survey of 120,000 infrared-selected galaxies was completed in 2005, and from 2003–2013 the UKST then carried out the RAdial Velocity Experiment (RAVE) to measure the radial velocities and metallicities of around to 0.5 million stars in the Milky Way Galaxy.
 Passage 2:Green was selected by the Baltimore Ravens in the 5th round (158th overall) in the 2005 NFL Draft. He was utilized mostly as a blocking fullback in 2005 by the Baltimore Ravens. His solid play was rewarded with 4 starts and 12 games played in his rookie campaign. Green played in both the Ravens Monday Night Football games in 2005, and started one of them. His game worn jersey from the Monday Night game with Green Bay was auctioned on eBay and sold for a few hundred dollars. Green also played on special teams. He made his NFL debut on September 11 versus the Indianapolis Colts. Green finished the year with 4 yards rushing on 5 attempts, and 32 yards on 7 catches with no touchdowns.
 Passage 3:The accolade was first presented at the eleventh Billboard Latin Music awards in 2005 to Puerto Rican singer Daddy Yankee for his album Barrio Fino (2005). The record made Daddy Yankee the first reggaeton act to debut at the top of the Billboard Latin Albums chart and became the best-selling Latin album of the decade (2000-2010) in the United States. Yankee also received the accolade at the 2006 and 2008 awards ceremonies for his albums Barrio Fino: En Directo (2006) and  (2007). Don Omar became the second and only other artist to win the award at the Billboard Latin Music Awards of 2007, where his album King of Kings (2006) was awarded. Puerto Rican singer Ivy Queen is the most nominated artist without a win, with three nominations, and the only female nominee. The Billboard Latin Music Awards of 2009 introduced thirteen new categories, one of which, the Latin Rhythm Album of the Year award, replaced the accolade for Reggaeton Album of the Year.

Output:
1