Well, good question! I didn't know either, but here's what answers.com says:
"Following the success of the 13-episode season one, the Sci Fi Channel commissioned a full 20-episode second season. The season premiered in the U.S. on Sci Fi Channel on July 15, 2005, with the UK, Ireland and Canadian premiere in January 2006. In the Fall of 2005, airing of the second season halted as it was part of Sci-Fi Channel's standard airing schedule normally used for its Stargate series, which was to split a 20-episode season into two parts (a "winter season" and a "summer season", to avoid heavy competition with major networks that follow a spring / fall schedule). Universal Home Video took this break as an opportunity to package the episodes aired thus far into a DVD set, calling it Season 2.0. The final episode of the first half, "Pegasus," was originally 15 minutes too long for broadcast, but according to creator Ronald Moore, the production team decided to cut the episode to time rather than pad it out to fill 90 minutes, as this was deemed impractical. The longer version of "Pegasus" appears on the Battlestar Galactica Season 2.5 DVD set, which was released in the U.S. on September 19, 2006."
![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
(no subject)
Date: 2007-03-21 03:17 pm (UTC)"Following the success of the 13-episode season one, the Sci Fi Channel commissioned a full 20-episode second season. The season premiered in the U.S. on Sci Fi Channel on July 15, 2005, with the UK, Ireland and Canadian premiere in January 2006. In the Fall of 2005, airing of the second season halted as it was part of Sci-Fi Channel's standard airing schedule normally used for its Stargate series, which was to split a 20-episode season into two parts (a "winter season" and a "summer season", to avoid heavy competition with major networks that follow a spring / fall schedule). Universal Home Video took this break as an opportunity to package the episodes aired thus far into a DVD set, calling it Season 2.0. The final episode of the first half, "Pegasus," was originally 15 minutes too long for broadcast, but according to creator Ronald Moore, the production team decided to cut the episode to time rather than pad it out to fill 90 minutes, as this was deemed impractical. The longer version of "Pegasus" appears on the Battlestar Galactica Season 2.5 DVD set, which was released in the U.S. on September 19, 2006."
Interesting! :-)