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We remember Dr. George Carruthers, who passed away Dec. 26. During his career at the U.S. Naval Research Laboratory, Dr. Carruthers invented the first Moon-based astronomy observatory, which was placed by Apollo 16 astronauts on the lunar surface: https://go.nasa.gov/3hlnq08 pic.twitter.com/7oo7ON5BpB

On Wed., Dec. 30 at 10:40am ET, Shannon Walker of @NASA_Astronauts & @Astro_Soichi of @JAXA_en will answer questions from pre-K & early elementary school students who are part of the @NOGGINKids community. Watch this live Earth-to-space call on NASA TV: https://go.nasa.gov/3aUoWFr pic.twitter.com/YwsEGBD0Fd

On a Mission Gravity Assist Curious Universe Houston, We Have A Podcast Enjoy one of our many podcasts: from engineering feats, to guided tours of the solar system, to the human stories behind the Apollo Moon landing. Listen and subscribe: http://www.nasa.gov/podcasts pic.twitter.com/6AzUYX2q6W

How did we get here? How do stars and planets come into being? What happens during a star's life, and what fate will its planets meet when it dies? Come along on this interactive interstellar journey through time: https://go.nasa.gov/3h2SvFS pic.twitter.com/Yi0OVA7k43

Be your own explorer at home — the universe is waiting. Subscribe to our weekly NASA newsletter and catch up on the latest updates in space, plus online activities and other content for kids, adults or the whole family. Sign up here: http://nasa.gov/subscribe pic.twitter.com/2SplNSGLJ0

Newborn stars, hidden behind thick dust, are revealed in this image of the Christmas Tree Cluster. Infant stars appear as pink and red specks toward the center and appear to have formed in regularly spaced intervals that resemble a snowflake's pattern: https://go.nasa.gov/3rxnC0M pic.twitter.com/i51mxqldfw

Our galaxy contains billions of stars, our Sun among them. If each of those stars has not just one planet, but, like ours, a whole system, then the number of exoplanets (planets beyond our solar system) is truly astronomical: into the trillions. https://go.nasa.gov/37thFdn pic.twitter.com/TswDFAFjvJ

Unwrapped a new device? Download the #NASA_App app to explore the universe & discover our home planet: http://www.nasa.gov/nasaapp pic.twitter.com/vnUzkeZNsw

A spectacular view of the "northern lights" as seen from the @Space_Station! This 2017 image shows the station's solar arrays in the foreground and entrancing reds and greens of the auroras, dancing above Earth. Enjoy more images like this: https://go.nasa.gov/2JjdSpM pic.twitter.com/Dv1bd6eFZB

The first time three humans spent #Christmas in space was over 50 years ago during Apollo 8. This year, current @Space_Station crew members will soar 250 miles above Earth in a much larger spacecraft. Here’s how they'll ring in the holiday season: https://go.nasa.gov/3mN4SHd pic.twitter.com/wN1wonLD3y

Have yourself a merry little GIFmas. Check out our holiday-themed GIFs on @GIPHY by searching "nasaholiday" and add some cheer to your social media game: http://giphy.com/nasa/astronauts-in-the-holiday-spirit … pic.twitter.com/y51Q0PsUDy

Happy Holidays! We have a gift for YOU! Download our #NASASelfies app and picture yourself in space. The app features images from our Spitzer Space Telescope along with contributions from @NASAHubble & @chandraxray: https://go.nasa.gov/2WHXqCv pic.twitter.com/XGRhCxrjsc

Season’s greetings to Earth from the @Space_Station! Crew members on orbit share what the holidays mean to them, and how they'll be celebrating in space. Bonus: a station vs. Mission Control decorating contest! Watch: http://youtu.be/QDALsVmNqJg pic.twitter.com/dyWZ93VjgK

“The vast loneliness up here of the Moon is awe-inspiring & it makes you realize just what you have back there on Earth. The Earth from here is a grand oasis to the big vastness of space”— Astronaut Jim Lovell #OTD in 1968, 'Earthrise' was photographed: https://go.nasa.gov/3nOWKam pic.twitter.com/yeIh0s0xTe

Are you waiting up for a visit from Santa’s sleigh? Our @NASA_Astronauts are doing the same! This year @NORADSanta is making a special stop to the International @Space_Station to deliver presents. Track where else he's going: http://noradsanta.org/ pic.twitter.com/H0RHyTb7fC

Searching the solar system for cool, last-minute gifts? Download + print new posters from @NASAAstrobio, featuring some of astrobiology’s greatest “heroes”: https://go.nasa.gov/3aAfQgR pic.twitter.com/A7aK4W7FDd

Think your neighbor has the best holiday decorations? Check out these celestial light shows: https://go.nasa.gov/2M4EKeg pic.twitter.com/2k5YaJTAq0