What does vs. mean in NASA?

Vs.

Vs. is the second studio album by the American rock band Pearl Jam, released on October 19, 1993 through Epic Records. After a relentless touring schedule in support of their 1991 debut album Ten, Pearl Jam headed into the studio in early 1993 facing the challenge of following up the commercial success of its debut. The resulting album, Vs., featured a rawer and more aggressive sound compared with the band's previous release. It was the band's first collaboration with producer Brendan O'Brien. Pearl Jam decided to scale back its commercial efforts for Vs., including declining to produce music videos for any of the album’s singles. Upon its release, Vs. set the record for most copies of an album sold in its first week, a record it held for five years. Selling 1,300,000 copies in its first ten days of release, it entered the record books; Vs. established Pearl Jam as one of the biggest bands the world would see. Vs. occupied the number one spot on the Billboard 200 chart for five weeks, the longest duration for a Pearl Jam album. The album has been certified seven times platinum by the RIAA in the United States.

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