NASA History Office's Twitter Profile Analysis @nasahistory on Twitter

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In April 837, Halley's comet made its closest known approach to Earth at 3.07 million miles away! Halley has been documented in art & science for thousands of years; the comet was even featured in the Bayeux Tapestry, which chronicles the Battle of Hastings in 1066. Image: @esa https://t.co/CLJKG0Qh1L

April 2019: Scientists released first-ever image of black hole! Captured by an international network of radio telescopes called the Event Horizon Telescope, the black hole in the image lies in the center of Messier 87, about 55 million light-years away from Earth. #BlackHoleWeek https://t.co/HRWplWA5iK

It's engine-ious... #OTD in 1965, @NASA_Marshall tested all 5 of the F-1 engines that made up the S-IC stage of the Saturn V! Each F-1 engine weighed over 9 tons, generated 1.5 million pounds of thrust, and had a potential energy output equal to the power of 85 Hoover dams. https://t.co/gV8KCfZYSQ

These pictures are w(Earth) it! 🌎 #OTD in 1999, the satellite Landsat 7 launches into orbit! Landsat 7 provides geometric data and, as with previous Landsat satellites, builds @NASA's archive of images of Earth. https://t.co/aGGOmxcl72

A mission patch for a Moon landing... When the creating the Apollo 11 insignia, @AstroMCollins found a picture in a @NatGeo publication and traced it using a piece of tissue paper! #MissionPatchMonth https://t.co/7LA19D7IZH

I like that space station. That is a nice space station. #OTD in 2002, Mission Control woke up the STS-110 crew with “All Star,” performed by Smash Mouth (@smashmouth) from the Shrek movie soundtrack. The song was chosen for astronaut Rex Walheim by his two children. https://t.co/ZcADpCpNAB

Never too mach of a good thing! April 1960: Legendary test pilot Major General Robert White flew NASA's X-15 for the first time. White would be the first pilot to fly to Mach 4, 5, and 6 (four, five, and six times the speed of sound), all in the X-15! https://t.co/JxrUNVr9t4

Today is the day! Join us! https://t.co/kZ4eJwt6S8

"Houston, we've had a problem." This famous phrase was spoken #OTD after the rupture of a service module oxygen tank. From there, the question became, how do we get Apollo 13 astronauts back to Earth? Experience our "successful failure" in real time: https://t.co/lHa3A8JqcB https://t.co/OhADKBehT0

In honor of the upcoming 60th anniversary of Americans in space, we'll be telling the story of spaceflight through the lens of our mission patches! The NASA tradition to let crews design their own patch began with the crew of Gemini V (patch below). Happy #MissionPatchMonth! https://t.co/fy1ZcFmnYj

On Wednesday, April 14th at 11:00 am ET, Dr. Jenifer Barton will be presenting a talk titled: "Branding the Earth: A History of the Earth System Concept in the United States, 1983-1988." Join us! https://t.co/xKNf8FeLB5 https://t.co/EsfBGnuEJb

“Poyekhali!” (Let's go!) #OTD in 1961, USSR cosmonaut Yuri Gagarin became the first human in space after being launched aboard his Vostok 1 spacecraft! His flight began a new era of human spaceflight and escalated the space race. https://t.co/rXy7gGvg6w

#OTD in 1981, the Space Shuttle Columbia launched on the inaugural flight of the Space Shuttle Program! Aboard the spacecraft were John Young and Robert Crippen. The Columbia was named after a ship that explored the Columbia River in 1792. #40thAnniversary #FirstShuttleFlight https://t.co/u0e8TdtOVi

“Malcolm S. Carpenter, Leroy G. Cooper, John H. Glenn, Virgil I. Grissom, Walter M. Schirra, Alan B. Shepard, and Donald K. Slayton … the nation’s Mercury astronauts!” #OTD in 1959, NASA introduced the Mercury 7 astronauts to the public! https://t.co/pQOzwYynpV https://t.co/nI4d6VxcvV

Today we remember Mary Jackson, NASA's first Black female engineer on what would be her 100th birthday! After spending decades as an aeronautical engineer at @NASA_Langley, Mary became the Federal Women’s Program Manager and shaped the next generation of NASA’s female employees. https://t.co/lK7RdrxiS1

Virginia T. Norwood, the engineer responsible for the first #Landsat multispectral scanner, has been honored with the 2021 @ASPRSorg Lifetime Achievement Award. Congratulations, Virginia! #MotherOfLandsat More: https://t.co/vE07kl0PXP https://t.co/JbCZUTUxjS

#OTD in 1972, #Apollo16 launched carrying astronauts John Young, Ken Mattingly, and Charlie Duke to the Moon. https://t.co/cVJ426VYkX

☕😮 Woah. Imagine seeing this on your coffee break. Today in 2012, Space Shuttle Discovery was mated to the top of NASA's Shuttle Carrier Aircraft in preparation for its flight to DC to join our collection. https://t.co/3yYEVFXJhN

Our planet is changing. Explore those changes with a comprehensive picture of our changing planet via Timelapse in Google Earth -- a partnership with @GoogleEarth, @USGS, @ESA, and @EU_Commission. 🛰️🌎⏰ https://t.co/QquG363wG4

“This is the world’s greatest flying machine, I’ll tell you that." – STS-1 commander John Young after space shuttle Columbia returned to Earth for the very first time. https://t.co/U9XPLifShw

We are saddened by the recent death of Apollo-era astronaut Dr. Philip K. Chapman. The first Australian-born American astronaut, he was selected to be a member of Astronaut Group 6, and served as a mission scientist for the Apollo 14 missions: https://t.co/CbSoXOd8Sp https://t.co/8W0gY44FJH

The #Apollo13 astronauts were on a journey to the Moon 51 years ago today. You can experience the breathtaking views that the crew saw as they flew around the far side of the Moon through this visualization, created using data from @NASA's Lunar Reconnaissance Orbiter. https://t.co/Ry5YrenU1D

As we celebrate 60 years of human spaceflight, explore the differences between Yuri Gagarin's history-making spaceflight on this day in 1961, and Alan Shepard's flight a few weeks later. https://t.co/bupMEyIc9P

40 years ago today, @NASA_Astronauts John Young and Bob Crippen lifted off aboard Columbia in the first flight of the space shuttle. See what they were up to leading up to launch and during their two-day stay in orbit: https://t.co/6mkvhzhYIS https://t.co/91UkQ3Bz67

April 12 is the International Day of Human Space Flight. 60 years ago, Yuri Gagarin had his first historic flight into the cosmos. As we reflect on his accomplishment today, we look ahead to the future of human space flight as we prepare to send humans back to the Moon. https://t.co/RR0O5wrr9W

#OTD 40 years ago, the first space shuttle mission lifted off with @NASA_Astronauts John Young and Bob Crippen aboard. With 10 years of design and development, the shuttle was the first of its kind — a reusable vehicle for travel to low-Earth orbit: https://t.co/XHV1QTkXuu https://t.co/JC5KsylY19

We're kicking off #BlackHoleWeek⚫ with Sagittarius A*, the supermassive black hole at the center of our Milky Way Galaxy! Back in 2013, Chandra caught our friendly neighborhood #BlackHole flaring up as it likely tore apart & devoured an asteroid. 🤯 https://t.co/FWub6M4Rba

Today, on what would have been Mary W. Jackson's 100th birthday, we honor and celebrate her life and legacy @NASA! Learn more about how she made her mark on history: https://t.co/sPbAQ1xWfh https://t.co/F1eDePsqEg

Engineer, mentor, friend. Today we celebrate Mary W. Jackson on what would have been her 100th birthday. NASA’s first Black female engineer, Jackson continues to inspire the next generation of trailblazers: https://t.co/bMiPQtP2Af https://t.co/bhtbqJPYDq

'Twas the week before launch... 🚀 In 1981, @NASA_Astronauts John Young and Robert Crippen were preparing for the first space shuttle launch on April 10 – but things didn't quite go as planned. 40 years ago in @NASAHistory: https://t.co/GOvZTs3TXD https://t.co/We9bdRVzJD