@RossDynamicsLab
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Engineering math professor at @Virginia_Tech. Dynamics and transport, from spacecraft trajectories to airborne agricultural pathogens.
Virginia
Joined July 2015
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What if a spacecraft could cycle between Earth and Moon orbits, performing multiple circuits of each, naturally and indefinitely, with zero propulsion?
We’ve discovered a new class of stable, prograde, low-energy cycler orbits that do just that.
Why these orbits matter:
Ballistic → fuel-free
Stable → long-term ready
Near-chaotic → agile with low ΔV
Low-energy → access to Earth/Moon, Lagrange points, Sun–Earth L1/L2, even heliocentric space
At the AAS/AIAA Astrodynamics Specialist Conference in Boston next week, I’ll present on a new family of ballistic Earth-Moon cycler orbits that are stable, prograde, and mission agile—unlike any cyclers in the current literature.
The example below is shown in both the Earth-Moon rotating frame and inertial frame.
Conference Paper: ross.aoe.vt.edu/papers/ross-…
Now interactive: my simulation of 500,000 orbital data center satellites. Pick any latitude, date and time, then explore two brightness models alongside actual stars. App and code in the first reply. Try your sky and report back.
Try the app:
sdross0.github.io/orbital-da…
Code, assumptions and corrections:
github.com/sdross0/orbital-d…
Shane Ross retweeted
Oh it's even more widespread:
- only 30% of 100 published psychology studies could be reproduced
- only 25% of 67 published drug-target findings could be reproduced
- only 11% of cancer research could be reproduced
- even high-profile physics results get retracted.
Some references
– Ioannidis, J.P.A., "Why Most Published Research Findings Are False," PLOS Medicine 2(8): e124 (2005)
– Open Science Collaboration, "Estimating the reproducibility of psychological science," Science 349(6251) (2015)
– Prinz, F., Schlange, T., Asadullah, K., "Believe it or not: how much can we rely on published data on potential drug targets?" Nature Reviews Drug Discovery 10, 712 (2011)
– Begley, C.G. and Ellis, L.M., "Drug development: Raise standards for preclinical cancer research," Nature 483, 531–533 (2012)
I made a little video for a class on data science on this (during COVID, hence the mask):
youtu.be/h74yWYL_Z08
Shane Ross retweeted
Map of 300 years worth of mining tunnels underneath Cornwall, UK.
[Keith Russ / abandonedminemodels. com]
Shane Ross retweeted
Get ready to wave to an asteroid 👋🪨
In 2029, asteroid Apophis will swing by Earth, passing safely about 20,000 miles from the surface. The OSIRIS-APEX mission will meet up with the asteroid shortly after, to map the surface and study its chemical makeup.
Shane Ross retweeted
Power changes what’s possible on the lunar surface.
Our Power Tower is a 20-meter-tall, vertically deployed solar array system designed to provide more than 10 kilowatts of power for Moon Base operations at the lunar South Pole. Its modular architecture will support future surface networks, extending power beyond the lander to the assets that need it most.
Explore the concept in our animation below, then watch a successful real-world deployment: youtu.be/wcirOp_E2J0
Shane Ross retweeted
Could asteroid 1998 KY26 resemble the failed Soviet spacecraft Phobos 1?
This animation compares the observed 82°-phase photometry with our rotating Phobos 1 shape model.
For smoother rendering and full interactive control, explore the WebGL version:
adamhibberd.com/phobos-1-pho…
If you ever wanted to explore the physics Principle of Least Action, the way Feynman did in high school, now you can!
Adjust the path height vs. time for a mass thrown vertically: tinyurl.com/2hw9h3cn
The new building! New types of learning spaces like round classrooms, labs for rapid prototyping, the @CREATe_VT Wind Tunnel, and more! See 3D AI views.
With approximately 285,500 square feet across five stories, Mitchell Hall is a state-of-the-art engineering building designed to accelerate experiential learning and research innovation. 🤩🏫
Take an interactive tour of our newest building! ➡️ go.vt.edu/us3pK
ALT Rendering of Mitchell Hall with text: A look inside Mitchell Hall.
Science finds, Industry applies, Man con-forms. Science discovers, genius invents, industry applies, and Man adapts himself to or is molded by new things.
- Guide to the Chicago World’s Fair 1893
This is some kind of insurance scam, I can feel it
Sometimes I think about those monkeys with night vision
🇨🇳CHINA GIVES BLIND MICE SIGHT AND MONKEYS NIGHT VISION WITH RARE METAL?!
Chinese scientists just gave blind mice their sight back and let a monkey see infrared light.
Yes, really.
The secret weapon? A rare element called tellurium.
At Fudan University, researchers built a retina implant using tellurium nanowires so thin they make a human hair look like a tree trunk.
When implanted into blind mice, the animals started reacting to light and even passed vision tests.
Their brains lit up too, confirming the signals were real.
Then came the monkey.
A sighted monkey with the implant gained the ability to see infrared light, which is normally invisible to mammals.
Think heat vision, no goggles required.
Tellurium works like the retina’s natural light sensors. It takes in light, including infrared, and turns it into electrical signals for the brain to read.
The implants showed no harmful effects and needed no extra power source.
This breakthrough could lead to bionic eyes for humans. It might restore vision or even give people infrared sight.
Source: Interesting Engineering
You can steady people who fidgeted too much in old long exposures
grok.com/imagine/post/51657e…
🤖 Made with AI
