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Hop David Profile
Hop David

@HopDavid41

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131 La Mina Ave, Ajo, AZ 85321
Joined May 2012
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@HopDavid41
Hop David
20 hours
I so want this issue. I used to be able to buy Astronomy Magazine at Fry's Supermarket. But now they don't have a magazine section any more.
@AlanStern
Alan Stern
20 hours
Check out the new issue of Astronomy magazine on store shelves and on the web! I'm honored immensely to have my piece on The Five Great Revolutions in Planetary Science that have occurred during my career as the cover article!. Thanks @deicherstar and @AstronomyMag!
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@HopDavid41
Hop David
3 days
A rendition of the Lunar Hill Sphere as a bay with access to earth orbits as well as the greater solar system. I expect different locations along the bay like EML2, EML1 and NRHOs would all be near one another in terms of delta V, having similar Jacobi numbers. @RossDynamicsLab
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@HopDavid41
Hop David
15 days
RT @RossDynamicsLab: A third interstellar object, 3I/ATLAS, has been discovered. This simulation shows how such fast-moving visitors might….
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@HopDavid41
Hop David
15 days
RT @pickover: Math, physics, geometry, architecture. This is mathematical physicist Roger Penrose, standing on floor with Penrose tiling.….
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@HopDavid41
Hop David
19 days
RT @RossDynamicsLab: An interstellar object, the third ever discovered, is inbound at 66 km/s with a diameter of 20 km. Currently 4.8 AU fr….
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@HopDavid41
Hop David
1 month
A YouTube short calling out Neil Tyson's wrong history?.I am expecting the sun to rise in the west. @rmathematicus @TimONeill007 @JonathanSarfat1 @fakehistoryhunt @MichalYouDoing.
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@HopDavid41
Hop David
2 months
People are still thinking about lunar water:.
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@HopDavid41
Hop David
3 months
So far the Dow under Trump is falling faster than under Bush 43 or Hoover. Trump is like Herbert Hoover and Neville Chamberlain rolled into one.
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@HopDavid41
Hop David
3 months
Twitter has flagged my blog warning people I could be a source of misinformation. Don't know if the warning is triggered by a specific page or my blog in general. This is a test:.
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@HopDavid41
Hop David
4 months
RT @davidharsanyi: Not a real conservative according to JD Vance.
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@HopDavid41
Hop David
4 months
Anyone know Eagle Sarmont? His website seems to have expired. I recall @Nick_Stevens_Gr doing graphics for him. But Nick is no longer on Twitter?.
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@HopDavid41
Hop David
5 months
Posting so I can find it and read later. In terms of delta V the Lunar Hill Sphere is spitting distance from the Earth Hill Sphere, Earth escape as well as some important earth orbits. I believe the Lunar Hill Sphere will become a strategic volume.
@ispace_inc
ispace
5 months
Deep space maneuver completed successfully! RESILIENCE is now on a path towards the boundaries of the Earth gravitational influence, a region so far from Earth that the gravity of the Sun starts to be relevant. Join us tomorrow for the livestream of our SMBC x HAKUTO-R Venture
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@HopDavid41
Hop David
5 months
RT @RossDynamicsLab: Orbital Motion in Cislunar Space: Orbital dynamics beyond GEO is best described by a 3-body model, where a spacecraft,….
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@HopDavid41
Hop David
5 months
I am finding Twitter searches to be much less helpful since Elon damaged this platform.
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@HopDavid41
Hop David
5 months
RT @JackMtCulberson: #CSBG #Pluto #planet . Today is Pluto Discovery day, so I decided to create an image of my human version of planet Plu….
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@HopDavid41
Hop David
5 months
I had been saying that Angela Merkel had tried the Georgetown experiment on a larger scale and now Germany is burning more carbon than ever and its GDP had plummeted. But when challenged I could not find sources supporting my claims. Germany has indeed reduced carbon with solar.
@AlecStapp
Alec Stapp
5 months
Texas built 8 of the 10 largest solar projects in the US last year. And that's not because Texas rolls out the red carpet for renewables. It's because solar is winning on cost.
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@HopDavid41
Hop David
6 months
RT @Firefly_Space: SCALPSS is in action! Developed by @NASA_Langley, the SCALPSS payload onboard Blue Ghost will observe the effects of eng….
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@HopDavid41
Hop David
6 months
.@lougrims I had never known exhaust ions could damage a spacecraft. Is their work a step forward?.
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space.com
Electric propulsion is being increasingly used on space missions and could ultimately replace thrusters using chemical rockets.
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@HopDavid41
Hop David
6 months
RT @SETIInstitute: #PPOD: Icy Moons in Our Solar System That May Have Oceans. Scientists think six icy moons 🧊 in our solar system may curr….
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@HopDavid41
Hop David
6 months
RT @elonmusk: Congratulations on reaching orbit on the first attempt! .@JeffBezos.
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