News and commentary about the Great Frontiers

ISS007-E-10807 (21 July 2003) --- This view of Earth's horizon as the sunsets over the Pacific Ocean was taken by an Expedition 7 crewmember onboard the International Space Station (ISS). Anvil tops of thunderclouds are also visible. Credit: Earth Science and Remote Sensing Unit, NASA Johnson Space Center

Image Credit: ISS007-E-10807 (21 July 2003) – Earth Science and Remote Sensing Unit, NASA Johnson Space Center

Dawn Prepares for Launch



Despite a 24-hour delay, preparations continue for the launch later this week of the Dawn spacecraft to explore two members of the Asteroid Belt. Dawn is now scheduled to be launched between 7:25 and 7:54 AM EDT on Thursday, September 27, 2007 after weather today interrupted the planned completion of launch vehicle fueling. The spacecraft will be launched from Space Launch Complex 17B at Cape Canaveral Air Force Station, Florida, USA using the Delta 2925H launch vehicle.

The launch period between September 26 and October 15, 2007 will allow Dawn to reach both Asteroid Vesta and recently reclassified dwarf planet Ceres as planned. Dawn has been repeatedly postponed due to a slew of other mission launches this summer and fall. These delays follow the cancellation and surprise reinstatement of the mission after earlier cost concerns were capped and technical issues were addressed.

The Dawn mission is unique because a single spacecraft will enter orbit around two separate bodies. Dawn will use an advanced ion propulsion system to enter orbit around Vesta in 2011 and then Ceres in 2014. Vesta and Ceres are the two largest objects in the Asteroid Belt and are expected to give planetary scientists a glimpse at the early history of the solar system. Scientists believe Vesta and Ceres have had very different histories despite similar beginnings.

NASA TV will broadcast the launch live.

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