Dr. Phil Metzger

@DrPhiltill

Planetary scientist at . CoFounder NASA KSC SwampWorks. Space Mining. Space Settlement. Science. Instagram

Vrijeme pridruživanja: prosinac 2012.

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  1. Prikvačeni tweet
    19. kol 2019.

    Resources on the Moon? Yes! Interview at – mjesto: WKMG TV-6

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  2. prije 20 sati

    Traveling to Washington DC in the morning to help judge the NASA Big Idea Challenge. Then to Providence RI over the weekend to lead some student discussion at the Space Horizons workshop. Interacting with enthusiastic & creative students is the best part of this job!

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  3. 4. velj

    Years ago I asked to weigh the brick fragments when the Shuttle launch pad ripped apart. (What a horrible mentor I was!😅) At dinner tonight somebody says, well, she was doing real geology. It was a Holocene sedimentary deposit emplaced by ballistic deposition.🤣

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  4. 4. velj

    At today. Its pretty awesome when your lobby decoration is a rocket that flew to space and landed five times.

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  5. 2. velj
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  6. 1. velj

    My Twitter drafts folder is filled with tweets I composed then had better sense not to send. When I die, someone tell Twitter to go abead and tweet all of them.

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  7. 1. velj

    10/...because I told her how cool it is, it is now impossible to convince her to show her work. 🤦‍♂️🤷‍♂️

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  8. 1. velj

    9/ The re-scalability of nature allows even deeper insights. We know the cosmos follows various symmetries. The ability to rescale things is a type of symmetry. So anyhow I thought it was cool that Natalie figured out she can rescale equations to solve them in her head. Sadly,...

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  9. 1. velj

    8/ I have some ideas but it still isn’t solved. I presented this work here:

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  10. 1. velj

    7/ It turns out the “leftover” units are equal to velocity. There is some velocity in the physics that governs erosion rate which we haven’t accounted for in the equations to make all the units cancel out! We already included velocity of the rocket exhaust gas, so what is it??

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  11. 1. velj

    6/ In the research on how rocket exhaust blows lunar soil, the experiments show that erosion rate is proportional to various parameters like gas density, and inversely proportional to things like gravity and sand density—but the units don’t cancel out! Something is wrong!

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  12. 1. velj

    5/ This is called the Buckingham Pi Theorem. The combinations of units that we invent are called “unitless parameters” (duh). Famous examples include the Reynolds Number (predicts turbulence) and the Mach Number (predicts supersonic shockwaves).

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  13. 1. velj

    4/ We know that nature doesn’t care what scale our human brains are using. Therefore, all of our engineering units *must* cancel out. So we can write all the different combinations of things that do cancel out, and we *know* that nature is controlled *only* by those combinations.

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  14. 1. velj

    3/ For example, when you solve equations to prove a bridge can carry a certain load, you can use tons, kilograms, or even pounds in the equation. The engineering units we choose make no difference to the result. That scale is just a “human interface” to the actual physics.

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  15. 1. velj

    2/ I was shocked so I asked her how she did it. She said she rescaled the values of all the numbers to a range that was easier to track in her head. Then she went through this and that operation; then she scaled it back to the original scale. Rescaling is super cool trick!

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  16. 1. velj

    Dropping my girl off at a Math enrichment program. We can’t convince her to show her work: she does everything in her head. I thought she was cheating but I watched her solve a complex problem once. She wrote with her finger in the air for a minute then penned the answer.🤷‍♂️/1

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  17. 1. velj

    The Focault pendulum in the UCF math building. It is a way to directly show that the Earth is spherical & turns. The pendulum slowly changes its swing plane at a rate predicted by the equations for Earth’s rotation. First demonstrated publicly in Paris in 1851 by J.B.L. Focault.

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  18. 1. velj

    Time to build the robot!

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  19. proslijedio/la je Tweet
    1. velj
    Odgovor korisniku/ci

    IMO Mars missions can be done in a few decades, but it will require reliance on private companies that have healthy cash flow & established capabilities in cislunar space, rather than NASA paying for everything. The *strategy* Congress is pushing on NASA doesn’t make sense.

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  20. 1. velj

    A Mars campaign similar to the 6 Apollo Moon landings will cost $1.5 Trillion. That’s all of NASA’s budget for 75 years. Tech will be so far ahead by then, we *won’t use* anything we build for Mars today. NASA missions make sense only if we can afford & execute them in ~20 years.

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  21. 1. velj

    I joined 16 colleagues signing this letter that thanks the House for the AWESOME bipartisan support of NASA and requests renewed emphasis on lunar resources including a lunar outpost. This is the only logical path for NASA to reach Mars.

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