A pair of galaxies resemble a waterfall in this @NASAHubble image. Interacting galaxies influence each other, which may eventually result in a merger or unique formation. Here, stars from one galaxy appear to fall into the other like drops of water: https://t.co/CA7Uw76FsQ https://t.co/8E3orn6dGx

What do Albert Einstein, GPS, & a pair of stars 200,000 trillion miles away have in common?

An effect called the "gravitational redshift” from Einstein’s General Theory of Relativity. Using @ChandraXray, astronomers discovered the phenomenon in two stars: https://t.co/fsYYh2iKj9 https://t.co/nol8Xqjxwr

🏙️ A test stand 35 stories tall. 
 Four RS-25 engines. 
 Over 500 sensors and systems. 

Our @NASA_SLS rocket is being prepared for the last two core stage tests in the "Green Run" series at @NASAStennis: https://t.co/sngbDrPqmn https://t.co/UdEnIkrOKJ

RT @NASASun: It’s #SunDay — with a special guest, the Moon! Our satellite’s view of the Sun was briefly interrupted by a lunar transit on Oct. 16. At peak, the Moon covered about 44% of the Sun. https://t.co/0RETP4HFey https://t.co/V0nOGcj8D4

RT @NASAAstrobio: Asteroids are the storytellers of our solar system’s youth. This week, @OSIRISREx collected an asteroid sample & will bring its stories to Earth.

Why is it that asteroid Bennu holds the history of our origins? Let’s go back to the beginning: https://t.co/IUr41QON2t https://t.co/nz8mPJ4afU

 As we are preparing for the full engine firing test for the #Artemis I mission, we’ve been asking you — yes, you! — to tell us what you would pack for the Moon. 
 
📸 For inspiration, here's what our own imagery experts would put in their #NASAMoonKit: https://t.co/unsgJeQGLh https://t.co/p5xkEsuQb3

Our orbiting laboratory circles the Earth every 91 minutes and 12 seconds. Can your workout beat one @Space_Station orbit?  ‍♀️ 

Tag your #SweatinWithTheStation photos to commemorate 20 years of continuous human presence in space: https://t.co/p7jcDwvUJV 
#SpaceStation20th https://t.co/xIib9daaNw

RT @NASA_Johnson: We are readying for #LaunchAmerica! The lead @NASAFltDirector for @NASA’s SpaceX Crew-1 mission schools us on planning for this flight and future ones to the @Space_Station on this week's "Houston We Have a Podcast."
https://t.co/FvNQLiieZC https://t.co/yplqaquOSq

This week...

🛰️ Our @OSIRISREx spacecraft's historic TAG of asteroid Bennu
‍ @Astro_SEAL safely returns home from the @Space_Station
 Preparing to launch the ocean-observing satellite Sentinel-6 Michael Freilich

Watch: https://t.co/1WxAYyeex5 https://t.co/0lBVB9jS0Y

13 years + 42 assembly flights = 1 fully constructed @Space_Station that 241 space travelers from 19 countries have called home.

Learn more about the teamwork it takes to construct an orbiting laboratory and maintain it today: https://t.co/yaAqzTS99a
 #SpaceStation20th https://t.co/12xBPl2kas

Good news: on Oct. 20, our @OSIRISREx spacecraft captured more than enough material from asteroid Bennu to meet mission requirements! The team is now focused on stowing the sample for return to Earth in 2023: https://t.co/4etvnJzXfn #ToBennuAndBack https://t.co/ILUzEJZHD8

LIVE: Tune in for a mission update from @Dr_ThomasZ of #NASAScience & @OSIRISREx principal investigator Dante Lauretta. On Oct. 20, our spacecraft journeyed #ToBennuAndBack to collect a sample. Learn what they've found and the mission's next steps: https://t.co/mzKW5uV4hS https://t.co/JvGdyDlljs

Today at 5pm ET: @Dr_ThomasZ of #NASAScience & @OSIRISREx principal investigator Dante Lauretta provide an update to discuss what they know about the sample collected during the spacecraft's TAG (Touch-and-Go) attempt on Tues., Oct. 20. More: https://t.co/uzhWBEvAj8 https://t.co/ORoswuE2UM

RT @Dr_ThomasZ: Join me and @OSIRISREx Principal Investigator Dante Lauretta at 5 p.m. ET as we take media questions about the sample the mission collected from asteroid Bennu on Tuesday: https://t.co/dY9HOzcLHY https://t.co/kGNQUv5ZJs

The next @SpaceX cargo delivery to the @Space_Station is targeted for no earlier than December out of @NASAKennedy. Media accreditation is now open: https://t.co/LwGqfNCWjw https://t.co/PL5NYqfvbn

This week on #SpaceToGround: Chris Cassidy (@Astro_SEAL) & cosmonauts Ivan Vagner and Anatoly Ivanishin returned to Earth after a 196-day mission. Plus, the answer to a ?: do astronauts ever experience a language barrier on the @Space_Station? Watch: https://t.co/b35I2T2h5f https://t.co/2EqWgI9Mpf

 New Episode Alert: An Astronaut's View of Earth

Earth has been called “a brilliant jewel in the black velvet sky.” Explore the many faces and moods of our fierce and powerful planet with us in the latest @NASAJPL podcast “On A Mission.”

 Listen: https://t.co/y4VOQcaCHO https://t.co/yShERFsVot

An intense August storm gave Iowans a sense of what winds of a hurricane might feel like. To help officials understand the scale & scope, @NASA_Langley researchers used data & imagery from Earth-observing satellites & radars. 

 About their findings: https://t.co/D5Gi1cKcSJ https://t.co/YWdTPmI3Zh

 The colors, Duke, the colors! 

Our space telescopes help us see a whole @NASAUniverse of color, as seen here in the Small Magellanic Cloud. Explore more images on #NationalColorDay in our image library: https://t.co/VBp4Plnp9A https://t.co/RNUPLaGD0R

🗳️ Yes, astronauts can vote from space! Here's how it works: https://t.co/ufpZlEAoqe https://t.co/bXsW9dchSh