Aldrin and flag of the United States on moon—Apollo 11, 49 years ago:

Aldrin and flag of the United States on moon—Apollo 11, 49 years ago: #NASA pic.twitter.com/dNf6GNSdVi

— Michael Beschloss (@BeschlossDC) July 20, 2018

Trump to Establish ‘Space Force’ as New Military Branch

Trump to Establish ‘Space Force’ as New Military Branch https://t.co/sno4ueveSM via @JohnsonHildy #SpaceForce pic.twitter.com/FfwipExZcL

— National Review (@NRO) June 18, 2018

Trump directs Pentagon to create a Space Force as a separate military branch https://t.co/eiSDYXkyjX pic.twitter.com/KEGm9VAOaZ

— Washington Examiner (@dcexaminer) June 18, 2018

The Hubble Space Telescope finds an ‘Einstein Ring’

The Hubble Space Telescope finds an ‘Einstein Ring’ https://t.co/p5RY5BWMd4 pic.twitter.com/fut2hDmH0v

— Watts Up With That (@wattsupwiththat) April 13, 2018

The bending of light by a gravitational body was predicted by Albert Einstein in 1912...

Elon Musk says his Mars rocket will fly "short flights" next year

Musk Warns Mars Travelers: 'Good Chance You'll Die'... https://t.co/EIaGi1GMYk

— DRUDGE REPORT (@DRUDGE_REPORT) March 12, 2018

Elon Musk says you might be able to visit Mars as early as next year, but there’s a ‘good chance you’ll die’ pic.twitter.com/zxzf6EeTmx

— FOX & friends (@foxandfriends) March 12, 2018

Elon Musk says his Mars rocket will fly "short flights" next year https://t.co/2jqAFIuM0o pic.twitter.com/KeZabL8ArA

— CNN (@CNN) March 12, 2018

Elon Musk has built his companies to solve the problems that could bring about the end of the world https://t.co/vhWw8aP5YT

— TechCrunch (@TechCrunch) March 13, 2018

New planets! Astronomers have discovered two planets

New planets! Astronomers have discovered two planets using @NASAKepler data. K2-141 is an orange, Sun-like star with a hot super Earth and its Neptune-like companion: https://t.co/aTxCsBHefD@NASAExoArchive pic.twitter.com/iuwwz3TBzN

— NASA Planetquest (@PlanetQuest) January 18, 2018

R.I.P. Astronaut John Young

That psychiatrist who had a "private meeting" with a Republican Senator to "brief" him or her on the President's mental health? Nope. Happened to run into the Senator, unscheduled, on the hill, and had an "incidental" conversation. https://t.co/HCEKoTIaNj

— Josh Barro (@jbarro) January 6, 2018

NASA: Legendary astronaut, moonwalker John Young dead... https://t.co/YG8Z9HWKDZ

— DRUDGE REPORT (@DRUDGE_REPORT) January 6, 2018

U.S. Longest Serving Astronaut Dead at 87 https://t.co/I3Le66Yi1n

— BreitbartTexas (@BreitbartTexas) January 6, 2018

Thought you would want to know about this story from ABC7.https://t.co/dZzwDHblAO

— Michael Reagan (@ReaganWorld) January 6, 2018

Once upon a time in Houston, astronauts were our heroes. We studied them in school. We followed them to the moon. This is my ruler from elementary school. Rest in peace, John Young. #khou #HouNews pic.twitter.com/gbXJCJY6ca

— The Bishop (@BillBishopKHOU) January 6, 2018

Under Obama, NASA Loses A Planet. Under #Trump , #NASA Finds Seven In One Month

Under Obama, NASA Loses A Planet. Under Trump, NASA Finds Seven In One Month https://t.co/EIcDYA1NDL pic.twitter.com/QTn5dDPvJ9

— The Daily Caller (@DailyCaller) February 23, 2017

Iran Conducts Space Launch

Iran Conducts Space Launch https://t.co/z5VqfKpEZv via @BillGertz pic.twitter.com/KCbuJuhZiT

— Free Beacon (@FreeBeacon) April 21, 2016

NASA testing whether Potatoes can Grow on Mars

NASA testing whether Potatoes can Grow on Mars https://t.co/p3iYvyXIPA pic.twitter.com/EemNKHNzTY

— Watts Up With That (@wattsupwiththat) March 17, 2016

NASA: Dancing aurora lights seen from @Space_Station as it passes over the Pacific Northwest

Dancing aurora lights seen from @Space_Station as it passes over the Pacific Northwest: https://t.co/wGRnNalJYh pic.twitter.com/P5tgWJjuH4

— NASA (@NASA) January 25, 2016

SpaceX CEO Elon Musk says its reusable rocket can go back to space

SpaceX CEO Elon Musk says its reusable rocket can go back to space https://t.co/aaVYJHcJ58 pic.twitter.com/SW6tx5sIe4

— The Verge (@verge) January 2, 2016

Astronauts will be able to watch the new #StarWars film...in SPACE!

Astronauts will be able to watch the new #StarWars film...in SPACE! https://t.co/7Oi3hkpz8X pic.twitter.com/JucIisd52o

— SFGate (@SFGate) December 17, 2015

Pluto's rugged 'badlands' and mountainous shoreline are revealed in incredible detail

Pluto's rugged 'badlands' and mountainous shoreline are revealed in incredible detail https://t.co/pfi2HuhY5A pic.twitter.com/zML86uDdBc

— Daily Mail Online (@MailOnline) December 4, 2015

Solar storms hit Mars like a tsunami and strip air from the planet, NASA says

The @MAVEN2Mars mission reveals how the solar wind strips away the atmosphere of #Mars https://t.co/G5v6OjqQ3x pic.twitter.com/JfdsZoNTEf

— NASA Solar System (@NASASolarSystem) November 5, 2015

Solar storms hit Mars like a tsunami and strip air from the planet, NASA says https://t.co/neyLkMwNFS pic.twitter.com/t5Aq43TNmJ

— The New York Times (@nytimes) November 6, 2015

Researchers have found evidence of “streaks … formed by salty water” on Mars

"Water on Mars: What Does It Really Mean?" http://t.co/OXK5LQflj1 #science #feedly

— Thomas R. Stevenson (@ThomasStevenson) September 30, 2015

Is reality surpassing science-fiction on #Mars | @ashleydvo @exploremars @fxnscitech http://t.co/JuyRZ8QobG pic.twitter.com/sFy2UxTgef

— FoxNews.com Live (@FoxNewsLive) September 30, 2015

Congresswoman Sheila Jackson Lee was furious after learning a manned flight involving Matt Damon reached Mars before NASA.

— WH PRESS SECRETARY (@weknowwhatsbest) September 30, 2015

MORE: Researchers have found evidence of “streaks … formed by salty water” on Mars http://t.co/9tMMf1XR2G

— TheBlazeNOW (@TheBlazeNOW) September 28, 2015

[RPT] Seasonal Streaks Point to Recent Flowing Water on Mars: http://t.co/02dhLOWE7o (follow link for explanation) pic.twitter.com/huTiICMwqB

— Astro Pic Of The Day (@apod) September 30, 2015

A frost avalanche on #Mars caught in the act by @HiRISE http://t.co/DDlET9Tl11 cc: @elakdawalla @coreyspowell @esa pic.twitter.com/ZdbV8Z0X3V

— Massimo (@Rainmaker1973) September 30, 2015

We now know water flows on Mars. Did you know we're working to send humans: http://t.co/ptSYFvcuu3 #MarsAnnouncement pic.twitter.com/RGoZXkGA6T

— NASA (@NASA) September 28, 2015

How NASA's 'Real Martians' Are Preparing for Manned Trips to Mars http://t.co/H8SgjXSBsS

— Daryle Lockhart (@darylelockhart) September 30, 2015

Pluto: The size of it all.

The size of it all. Pluto is to the right of Neptune (large blue planet on right). pic.twitter.com/xR7eqFnGde

— Michael A Nöthem (@mikandynothem) July 18, 2015

The best thing about the Pluto image from NASA today is the silhouette of Pluto the dog right on it. pic.twitter.com/hVqD5QTwGz

— Scott Johnson (@scottjohnson) July 14, 2015

That's all, folks! We're out of "encounter mode" & back in "cruise mode." But, we'll keep picturing a receding Pluto & Charon.

NEW IMAGE: Charon, moon of Pluto! Learn more at: http://t.co/gjFcL6iN0O pic.twitter.com/BsSKNMW6J2

— NASA New Horizons (@NASANewHorizons) July 16, 2015

That's all, folks! We're out of "encounter mode" & back in "cruise mode." But, we'll keep picturing a receding Pluto & Charon. #PlutoFlyBy

— NASA New Horizons (@NASANewHorizons) July 16, 2015

#PlutoFlyby - it's a celebration! http://t.co/TdfpNlVINp pic.twitter.com/gGLDERVAZw

— NASA New Horizons (@NASANewHorizons) July 16, 2015

1,550,000 miles/2494483km from Pluto. The Student Dust Counter, built by @CUBoulder, & plasma instruments are still sampling. #PlutoFlyBy

— NASA New Horizons (@NASANewHorizons) July 16, 2015

Nasa's #PlutoFlyby

Believe it or not, we're in a golden age of space exploration: http://t.co/KdI61idsoR pic.twitter.com/RaCuD1v0f4

— The Week (@TheWeek) July 14, 2015

#PlutoFlyby: Nasa's New Horizons spacecraft enters key phase http://t.co/f8ycW7pCmf pic.twitter.com/bPCU9LV5Sf

— BBC News (World) (@BBCWorld) July 14, 2015

Gigantic asteroid near miss coming this Thursday

Gigantic asteroid near miss coming this Thursday http://t.co/6Q4Up2Pube

— Watts Up With That (@wattsupwiththat) May 12, 2015