WATCH LIVE TODAY: NASA Curiosity Mars Discovery Webcast …

NASA officials and space station partners will host a news conference Thursday (Dec. 18) to discuss the planned one-year mission to the International Space Station. The briefing starts at 10 a.m. EST (1500 GMT) and you can watch it live in the window below:

Broadcast live streaming video on Ustream

From NASA:"NASA astronaut Scott Kelly will launch to the space station in March 2015 to begin a yearlong stay aboard the orbiting laboratory -- the longest single space mission ever undertaken by an American. He will be joined by Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) on this one-year mission."

SpaceX Launch to Space Station Briefings

The private spaceflight company SpaceX is scheduled to launch its fifth official robotic resupply mission to the International Space Station Friday (Dec. 19), but NASA and SpaceX will host a series of news conferences Thursday (Dec. 18) to discuss the mission beforehand. You can watch the first briefing, a prelaunch conference, live in the window below starting at 12:00 p.m. EST (1700 GMT) on Thursday:

Broadcast live streaming video on Ustream

The other two press conferences detail the science flight to the space station onboard Dragon and will air at 1:30 p.m. EST (1830 GMT) and 3 p.m. EST (2000 GMT). You can also watch the live launch of the Dragon to the space station starting at 12:15 p.m. EST (1715 GMT) Friday, with liftoff set for 1:22 p.m. EST (1822 GMT).

NASA's Orion Test Flight

Update for Dec. 5 at 12:27 p.m. EST: As NASA's recovery teams work to retrieve Orion out of the Pacific Ocean, the space agency will hold a press conference at 1:30 p.m. EST (1830 GMT). Tune in to this page for post-splashdown coverage of NASA's Orion mission. FULL STORY:Splashdown! NASA's Orion Spaceship Survives Epic Test Flight as New Era Begins

NASA'sOrion capsule launched into space on its first-ever test flight at 7:05 a.m. EST (1105 GMT), riding atop a ULA Delta 4 Heavy rocket from Cape Canaveral Air Force Station in Florida. The capsule is made two orbits beforesplashing down in the Pacific Ocean. See Orion Test Flight Photos Here.Watch it live here:

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WATCH LIVE TODAY: NASA Curiosity Mars Discovery Webcast ...