NASA releases Blue Ghost movie landing while Firefly prepares lander to observe solar eclipse of the Moon by Earth
NASA today released a fantastic movie of Firefly’s Blue Ghost lunar lander as it touched down on the Moon on March 2, 2025, taken by four cameras mounted on the underside of its Blue Ghost lunar lander.
I have embedded the movie below.
The compressed, resolution-limited video features a preliminary sequence that NASA researchers stitched together from SCALPSS 1.1’s four short-focal-length cameras, which were capturing photos at 8 frames per second during the descent and landing.
The sequence, using approximate altitude data, begins roughly 91 feet (28 meters) above the surface. The descent images show evidence that the onset of the interaction between Blue Ghost’s reaction control thruster plumes and the surface begins at roughly 49 feet (15 meters). As the descent continues, the interaction becomes increasingly complex, with the plumes vigorously kicking up the lunar dust, soil and rocks — collectively known as regolith. After touchdown, the thrusters shut off and the dust settles. The lander levels a bit and the lunar terrain beneath and immediately around it becomes visible.
Engineers will use this imagery to better anticipate and possibly reduce the amount of dust kicked up during future landings.
Meanwhile, Firefly engineers are preparing the lander to observe tomorrow night’s lunar eclipse, but from a completely different perspective. On Earth we will see the Earth’s shadow slowly over five hours cross the Moon. On the Moon Blue Ghost will see the Earth cross in front of the Sun. Because of our home world’s thick atmosphere, there should be a ring remaining during totality.
Because the Moon will be in shadow during the eclipse, the challenge will be power management, operating the spacecraft solely on its batteries.
On Christmas Eve 1968 three Americans became the first humans to visit another world. What they did to celebrate was unexpected and profound, and will be remembered throughout all human history. Genesis: the Story of Apollo 8, Robert Zimmerman's classic history of humanity's first journey to another world, tells that story, and it is now available as both an ebook and an audiobook, both with a foreword by Valerie Anders and a new introduction by Robert Zimmerman.
The print edition can be purchased at Amazon or from any other book seller. If you want an autographed copy the price is $60 for the hardback and $45 for the paperback, plus $8 shipping for each. Go here for purchasing details. The ebook is available everywhere for $5.99 (before discount) at amazon, or direct from my ebook publisher, ebookit. If you buy it from ebookit you don't support the big tech companies and the author gets a bigger cut much sooner.
The audiobook is also available at all these vendors, and is also free with a 30-day trial membership to Audible.
"Not simply about one mission, [Genesis] is also the history of America's quest for the moon... Zimmerman has done a masterful job of tying disparate events together into a solid account of one of America's greatest human triumphs."--San Antonio Express-News
NASA today released a fantastic movie of Firefly’s Blue Ghost lunar lander as it touched down on the Moon on March 2, 2025, taken by four cameras mounted on the underside of its Blue Ghost lunar lander.
I have embedded the movie below.
The compressed, resolution-limited video features a preliminary sequence that NASA researchers stitched together from SCALPSS 1.1’s four short-focal-length cameras, which were capturing photos at 8 frames per second during the descent and landing.
The sequence, using approximate altitude data, begins roughly 91 feet (28 meters) above the surface. The descent images show evidence that the onset of the interaction between Blue Ghost’s reaction control thruster plumes and the surface begins at roughly 49 feet (15 meters). As the descent continues, the interaction becomes increasingly complex, with the plumes vigorously kicking up the lunar dust, soil and rocks — collectively known as regolith. After touchdown, the thrusters shut off and the dust settles. The lander levels a bit and the lunar terrain beneath and immediately around it becomes visible.
Engineers will use this imagery to better anticipate and possibly reduce the amount of dust kicked up during future landings.
Meanwhile, Firefly engineers are preparing the lander to observe tomorrow night’s lunar eclipse, but from a completely different perspective. On Earth we will see the Earth’s shadow slowly over five hours cross the Moon. On the Moon Blue Ghost will see the Earth cross in front of the Sun. Because of our home world’s thick atmosphere, there should be a ring remaining during totality.
Because the Moon will be in shadow during the eclipse, the challenge will be power management, operating the spacecraft solely on its batteries.
On Christmas Eve 1968 three Americans became the first humans to visit another world. What they did to celebrate was unexpected and profound, and will be remembered throughout all human history. Genesis: the Story of Apollo 8, Robert Zimmerman's classic history of humanity's first journey to another world, tells that story, and it is now available as both an ebook and an audiobook, both with a foreword by Valerie Anders and a new introduction by Robert Zimmerman.
The print edition can be purchased at Amazon or from any other book seller. If you want an autographed copy the price is $60 for the hardback and $45 for the paperback, plus $8 shipping for each. Go here for purchasing details. The ebook is available everywhere for $5.99 (before discount) at amazon, or direct from my ebook publisher, ebookit. If you buy it from ebookit you don't support the big tech companies and the author gets a bigger cut much sooner.
The audiobook is also available at all these vendors, and is also free with a 30-day trial membership to Audible.
"Not simply about one mission, [Genesis] is also the history of America's quest for the moon... Zimmerman has done a masterful job of tying disparate events together into a solid account of one of America's greatest human triumphs."--San Antonio Express-News
Although Scott Manley discusses IM’s Athena in the first half of this video, he also ponders the question as to why commercial space companies have had such a hard time landing on the Moon, and compares modern landings with the Surveyor landers.
https://www.youtube.com/watch?v=ISZTTEtHcTg (26 minutes)
Manley touches on software, but not very deeply. I have additional thoughts on software problems. The 1960s had limited capability computers, so the software was the minimum needed to navigate to and land onto the Moon. Modern software tends to be large and complex. Add to that the tendency to have multiple sensors for navigation, guidance, and control, and I think we can see that modern software has a lot to sort through. There may even be some hubris involved. The lander that didn’t account for the drop-off of the terrain when it flew over the large crater that was its landing site had a fatal flaw in its error detection, where it ignored the altitude data, because the assumption was that a rapid drop of the terrain was a sign that the software interpreted as an obvious error in the data stream. The engineers had not updated the software for the new conditions when the landing site was changed from a large plane to the interior of a large crater.
Modern software engineers are putting in far more complexity, giving more room for unintended features (bugs) to crop up. Perhaps they think that they are adding flexibility and robustness, but the complexity give places for the team to get bit in the butt.
In the 1960s, less was more (as Hollywood often says), which really means less can be better. Stick to the basics and Keep It Simple.
Manley’s other points about the differences between 1960s landers and todays give good explanations as to why we cannot just land more Surveyors on the Moon. Essentially, it is time to do real work, not the basic preliminary test landings that the Surveyors made.
Edward: Hm. I wrote about this more than a year ago:
Have modern space engineers forgotten the importance of keeping things simple?
Nice that others are catching up. :)