Only 10 days left to get your #NASAcodes proposal in! Do you have what it takes to design & build an information display system within an augmented-reality environment that will help @NASA_Astronauts complete spacewalk tasks? Proposals due 12/15. Details: https://microgravityuniversity.jsc.nasa.gov/nasasuits.cfm pic.twitter.com/3pJPMwHIm9

No buts about it: these are Saturn's moons Tethys (L) and Dione (R) imaged by @CassiniSaturn on Dec. 6, 2010.pic.twitter.com/h1MpGdZCNp

#GenBeyond Mars Base Camp experience helps students learn how our & @NASA scientists will send humans to Mars http://lmt.co/2A8VgTB pic.twitter.com/urnqBVG4YJ

Instead of awful YouTube comments, why not start your day with this gorgeous shot of Dick Gordon training for Apollo 12? You'll never not be missed, Dick.pic.twitter.com/YXiZRp76PN

The observable universe is 93 billion light-years across. So far, no human has ventured farther than 1.3 light-seconds from Earth.pic.twitter.com/szZTAuzMQp

Good morning from the flight line at the KSC shuttle landing facility! Today we're moving GOES-S from the plane down the road to Astrotech for satellite processing and launch prep!pic.twitter.com/7EYnmKKQmv

#OTD 5 December 1968, ESRO's HEOS-1 launched from @NASAKennedy. HEOS-1 was 1st European satellite to venture beyond near-Earth space, studying magnetic fields, radiation & solar wind (needing an orbit stretching 2/3 of way to Moon) See: http://www3.imperial.ac.uk/newsandeventspggrp/imperialcollege/naturalsciences/physics/spat/newssummary/news_23-11-2013-15-53-44 …pic.twitter.com/PsaTArKf4K

Grasped in the hand of the #Canadarm2 robotic arm, the #Cygnus cargo spacecraft was detached from @Space_Station today. It will be released tomorrow and you can watch it live starting at 7:45 a.m. EST: http://go.nasa.gov/2kp2xrp pic.twitter.com/lCQB97C3xq

Tonight's Target: The Pleiades! Hint: Look East at 7:30 pmpic.twitter.com/eWGAmIRzyh

Pearls aren't formed around sand & grit but organic matter trapped in an Oyster, like pieces of worm.pic.twitter.com/LYDt3wGuWf

#HubbleClassic #OTD in 1993, astronauts Story Musgrave and Jeffrey Hoffman began the first spacewalk of Hubble’s first servicing mission, installing new gyros, electronic control units, fuse plugs & protective covers. The mission fully restored Hubble’s potential for exploration.pic.twitter.com/TtOsfcBTRl

#GOES16's sister satellite GOES-S, which will be called #GOES17, has arrived @NASA Kennedy Space Center aboard a @USairforce C-5 Super Galaxy cargo transport. Launch info: https://goo.gl/8XTz00 pic.twitter.com/SQcUL4SyFy

Nice ride. Today first fit check in #SoyuzMS07 which we are backup for. Space ship looks ready. Prime Crew are @AntonAstrey @Astro_Maker and @Astro_Kanai Launch is Dec 17. Stay tuned!pic.twitter.com/BGeFvgiigg

Please share and spread the word. @TheMarsGen is accepting applications to select students to receive full-paid #scholarships to attend #SpaceCamp in summer of 2018. Transportation is included! Learn more and apply here: http://themarsgeneration.org/scholarships/  #stemed #stem #stemgirlspic.twitter.com/qyuysqe5gp

Throughout 2017, #NASASLS RS-25 engines have been tested at @NASAStennis to collect critical performance data for @NASA's deep-space rocket. Read more about SLS engine testing >> https://go.nasa.gov/2goTWjj pic.twitter.com/ZIhU52h6jG

We live on a solar-powered planet. The Sun drives Earth’s ocean currents, seasons, weather and climate. https://go.nasa.gov/2AHQwUL pic.twitter.com/TPmKSe7eIy

Dawn of 5 December, 2014 was also as NASA PAO Mike Curie declared, the Dawn of .@NASA_Orion with the Exploration Flight Test 1 Launch at 7:05 AM EST. Orion’s maiden voyage was an unquestioned success. Learn more via #NASA - https://www.nasa.gov/press/2014/december/nasa-s-new-orion-spacecraft-completes-first-spaceflight-test …pic.twitter.com/N4jUr8tAke

#OTD in 2014, ULA's #DeltaIV Heavy blasted off, marking the "dawn of Orion and a new era of American space exploration" -- the Exploration Test Flight of @NASA_Orionpic.twitter.com/luzoJo6UWJ

#OTD in 1901, animator Walt Disney was born. Walt Disney worked with NASA on science education, producing several films regarding space exploration right before and at the start of the Space Race, including “Man in Space” (1955) and “Mars and Beyond” (1957).pic.twitter.com/LB1GqyP31I

#Win one of three copies of our latest issue, on sale Thursday! To enter, retweet and follow @spaceanswers by Mondaypic.twitter.com/uv4vNvCj1e

Thank you so much for the beautiful birthday surprise at LAX @AmericanAir #AATeam you're the bestpic.twitter.com/gxsQ4wUYTy