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#DreamChaser spacecraft arrived at @NASAArmstrong for testing to pave the way to take cargo & crew to @Space_Station http://go.nasa.gov/2k123Du pic.twitter.com/J2noqi4erV

Today is the 50th anniversary of the Apollo 1 tragedy. A new exhibit has opened at Kennedy Space Center in tribute to the astronauts lost.pic.twitter.com/LXXbtRWdwk

Join us now for the opening of a new tribute at @NASAKennedy honoring the crew of #Apollo1. Watch: http://go.nasa.gov/2jcr7dy  #NASARememberspic.twitter.com/stCqyf7hjO

#NASARemembers the Apollo 1 crew on the tragedy’s 50th anniversary. They gave their lives in pursuit of exploration: http://go.nasa.gov/2jcdNG2 pic.twitter.com/WYZSkak5Gl

#HTv6 released at 10:46am ET (3:46pm GMT). Robotics real-time animation provides view as video downlink drops. http://www.nasa.gov/nasatv pic.twitter.com/pJRCBLzNsG

2 astronauts (@Thom_Astro and @Astro_Kimbrough) are inside cupola preparing to command Canadarm2 to release #HTV6. http://www.nasa.gov/nasatv pic.twitter.com/q81a0zNz5d

Time-lapse shows old batteries removed during last two spacewalks stowed on pallet and installed in departing #HTV. http://www.nasa.gov/nasatv pic.twitter.com/IYL69wV3zV

Big day for me and my crew today! Our 100th day in space, and we are honored to be part of Japan's #HTV6 spacecraft release activities.pic.twitter.com/DLJjJnH7Uo

Live coverage of the departure of Japan's resupply ship begins today at 10am EST (3pm GMT) on NASA Television. http://go.nasa.gov/2kpzFuG pic.twitter.com/0LRkI3bGV4

Sleepy? You aren't the only one. See how we're studying astronaut sleep patterns aboard @Space_Station: http://go.nasa.gov/2k6SC7A pic.twitter.com/FKt08AlBYG

A test designed to detect amino acids, the building blocks of life on Earth, could enhance our search for life: http://go.nasa.gov/2jWEo7e pic.twitter.com/pGEBttAC0B

A group of astronomers from the H0LiCOW collaboration is measuring how fast the universe is expanding. Details: http://go.nasa.gov/2j9AJ8R pic.twitter.com/YnBtiudD5P

Want to feel the rumble of a rocket launch in-person?! Apply to attend our Feb. #NASASocial at @NASAKennedy in FL: http://go.nasa.gov/2j9oxVJ pic.twitter.com/YOcC19K0NY

Astronauts & spacecraft can be rattled by huge solar eruptions. Our new tool helps map solar storms: http://go.nasa.gov/2jVPI3D  @NASASunEarthpic.twitter.com/vldBKYSFTw

The 1st year of observational data from @NASASMAP will help forecast weather & monitor agricultural crop growth: http://go.nasa.gov/2jVuW42 pic.twitter.com/8GFzbIRFp7

Solar System This Week: Learn about the speed & final mission for @CassiniSaturn, citizen science on Jupiter & more! http://nasa.tumblr.com/post/156311936764/solar-system-things-to-know-this-week …pic.twitter.com/6uC9xQHfGi

We're honoring the Apollo 1 crew at 10am ET today. This year is the 50th anniversary of the tragedy. Watch live: https://www.nasa.gov/nasalive pic.twitter.com/68qOMv9m2Y

Japan's #HTV6 resupply ship is packed for Friday release and crew checks eyes to study vision in space. http://go.nasa.gov/2k0C9BN pic.twitter.com/Gw6DY2IGkc