Dale Andersen

If life was present on early Mars, was it able to harness the energy of the sun? Were those early cells able to construct Large Conical Stromatolites, as they were on early Earth? #CountdownToMars #biosignatures #earlyEarth #Mars

🚨📰 #USNAVY UPDATE: USS John P. Murtha to support NASA's Artemis II mission SAN DIEGO – Amphibious transport dock ship USS John P. Murtha (LPD 26) is slated to serve as the recovery ship for the Orion spacecraft and its crew upon their return from the historic Artemis II mission. The Artemis II mission is the first crewed flight of NASA's Space Launch System (SLS) rocket and Orion spacecraft, sending four astronauts on an approximately 10-day journey that will take them beyond the Moon. This mission will mark humanity's first crewed voyage to the vicinity of the Moon in over 50 years. Upon completion of their mission, the Orion capsule will splash down in the Pacific Ocean, where John P. Murtha and its crew will be prepared to recover the astronauts and the spacecraft.

@AlanStern @NASAScienceAA @NASA Exactly!

Ah, just like the old days when I was a kid, nerding out with popcorn, listening to astronauts on a lunar mission! Nothing better! Back then it wasn't showing on a laptop--there weren't any--it was on TV, and I was too young for a beer. Go @NASAScienceAA Artemis, Go @NASA!

#Mars is more than a destination — it’s a laboratory for understanding life and planetary evolution. Our new interactive outlines how human missions can advance top science goals while preparing for sustained exploration. Learn more: ow.ly/UWeJ50YCBXW

@NASAWatch Hope that is the right universe!

Happy #FirstContactDay to those who celebrate #StarTrek

@NASAWatch There is no dark side in the moon really, Matter of fact, it's all dark!

Technical note for people on TV today talking about #ArtemisII, the #Moon etc. There is a difference. [L] The Dark Side of The Moon [R] The Far side of the Moon

Dale Andersen’s Astrobiology Antarctic Status Report 16 March 2026: Spring Field Season Completed; Preparing The Fall Field Season astrobiology.com/2026/03/dale-a… #Astrobiology #Antarctica @DaleAndersen @SETIInstitute @NASAAdmin @ExplorersClub

Dale Andersen’s Astrobiology Antarctic Status Report: 15 February 2026: Diving Under The Ice At Lake Untersee astrobiology.com/2026/02/dale-a… #Astrobiology #Antarctica @DaleAndersen FYI @SolarGirl2018 @NASAAdmin @ExplorersClub @SETIInstitute

Dale Andersen’s Astrobiology Antarctic Status Report: 21 January 2026: Lake Untersee Base Camp Weather astrobiology.com/2026/01/dale-a… #Astrobiology #Antarctica @DaleAndersen @SETIInstitute

Dale Andersen’s Astrobiology Antarctic Status Report: 18 January 2026: Lake Untersee Base Camp Is Operational astrobiology.com/2026/01/dale-a… #Astrobiology #Antarctica @DaleAndersen @SETIInstitute

Dale Andersen’s Astrobiology Antarctic Status Report: 14 January 2026: Setting Up Base Camp At lake Untersee astrobiology.com/2026/01/dale-a… #Astrobiology #Antarctica @DaleAndersen @SETIInstitute

Southbound for Antarctica! We should be hitting the friendly skies tomorrow, 6 January, at 2PM (Local time, Cape Town - UTC+2)

PRESS RELEASE SETI Institute tracks pulsar “twinkle” to reveal how space distorts radio signals For 10 months, a SETI Institute–led team watched pulsar PSR J0332+5434 (also called B0329+54) to study how its radio signal “twinkles” as it passes through gas between the star and Earth. The team used the Allen Telescope Array (ATA) to take measurements between 900 and 1956 MHz and observed slow, significant changes in the twinkling pattern, or scintillation, over time. Pulsars are spinning remnants of massive stars that emit flashes of radio waves, a type of light, in very precise and regular rhythms. Due to their high rotation speed and incredible density. Scientists can use sensitive radio telescopes to measure the exact times at which pulses arrive in the search for patterns that can indicate phenomena such as low-frequency gravitational waves. However, gas in interstellar space can scatter a pulsar’s radio waves—spreading them out and slightly delaying when each pulse is received. Understanding and correcting these tiny, changing delays, which can be as small as tens of nanoseconds (a nanosecond is one-billionth of a second), helps keep pulsar timing as precise as possible. Just as starlight “twinkles” in Earth’s atmosphere, pulsar radio waves also “twinkle”, or scintillate, in space. As the signal travels through clouds of electrons between the pulsar and Earth, it creates bright and dim patches across radio frequencies. These patterns aren’t static; they evolve as the pulsar, the gas, and Earth move relative to each other. This twinkling delays the pulses, and the amount of scintillation matches the extent of the delay. By frequently monitoring a single bright, nearby pulsar, the team observed these patterns shift and translated them into tiny timing delays. These methods can then correct the delays that matter for the most precise pulsar experiments. Read more: seti.org/news/seti-inst…

When I was 22 years old, I commissioned as an Ensign in the United States Navy and swore an oath to the Constitution. I upheld that oath through flight school, multiple deployments on the USS Midway, 39 combat missions in Operation Desert Storm, test pilot school, four space shuttle flights at NASA, and every day since I retired – which I did after my wife Gabby was shot in the head while serving her constituents. In combat, I had a missile blow up next to my jet and flew through anti-aircraft fire to drop bombs on enemy targets. At NASA, I launched on a rocket, commanded the space shuttle, and was part of the recovery mission that brought home the bodies of my astronaut classmates who died on Columbia. I did all of this in service to this country that I love and has given me so much. Secretary Hegseth’s tweet is the first I heard of this. I also saw the President’s posts saying I should be arrested, hanged, and put to death. If this is meant to intimidate me and other members of Congress from doing our jobs and holding this administration accountable, it won’t work. I’ve given too much to this country to be silenced by bullies who care more about their own power than protecting the Constitution.

ISS astronaut Zena Cardman @zenanaut is participating in the 2025 Global Women’s Summit tomorrow, Thursday, 11/20.  Session begins at 9:30AM ET. She's the last speaker so she may not be on there until closer to – 11:00am ET. #NASA should mention this on @NASA to their 87.8 million followers. washingtonpost.com/washington-pos…

Caught Alexey Zubritsky, on one of his recent spacewalks, through the window of his own sleeping quarters. After installing a semiconductor experiment with Sergey Ryzhikov, Alexey had the task of wiping off the outside of his window. I loved the juxtaposition of something so hugely sublime as a spacewalk with something so relatable as cleaning a hazy window that you’ve been looking through for months. It’s apparently a really difficult worksite, with not much to hold on to, but Alexey is a natural at spacewalking. Totally surreal to be right there, inches from our friend. @JonnyKimUSA and I stayed at the window for a long time.

Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.

The U.S. Won’t Win the New Space Race by Defunding NASA scientificamerican.com/article/nasa-i… “some U.S. leaders now embrace space as a vital, contested domain. But while they insist they’re setting a course for America’s continued dominance in space science, technology and exploration, their actions are contradicting and undermining that goal.” #NASA

From the Earth to the Moon—one special moment in space and time, where the soft blues of the upper atmosphere fade into the gentle grey palette of the Moon before dissolving into the blackness of space. Well done, @Zenanaut!!

Do you live in the DC/Maryland/Virginia area? Do you care about inspiring the next generation of scientists and engineers? Then sign the petition urging the preservation of the @NASAGoddard Visitor Center. actionnetwork.org/petitions/save…

I wish people could understand that the ocean is not just a massive amount of salt water, but rather it's a living system. What we put into the ocean changes the chemistry of not just the ocean, but of the planetary functions as a whole. @TIME time.com/7290408/sylvia…