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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:…
An aero-braking near-Earth asteroid
A quick trip through the thermosphere turns newly-discovered asteroid ST25J47 from an Apollo to an Aten. It is no bigger than a meter.
While not gravitationally bound to Earth, 20-meter "quasi-moon" asteroid 2025 PN7 appears to circle the Earth as it follows a three-body orbit in the Sun–Earth system. Thanks to @tony873004 for the only orbit visualization I could find, in a rotating frame where both Earth and…
Watch Earth’s newest quasi-moon in motion. 🌍🌀 The new paper “Meet Arjuna 2025 PN7” confirms #asteroid 2025 PN7 is trapped in a quasi-satellite orbit, looping around Earth (in a rotating frame) from the 1960s to the 2080s. iopscience.iop.org/article/10.384…
"While spacewalking I realized something, I used to think I was scared of heights but now I know I was just scared of gravity" - NASA astronaut Reid Wiseman
Yes, but only for a while. In this simulation, 20 nearly identical pendulums start together, then diverge after a few seconds, the time horizon of predictability. Chaos doesn’t mean randomness, just sensitivity.
Every scholar who's published more than a handful of papers, has, at some point, "lied with statistics." Not maliciously, but just by simplifying. We pick the window, or the axis scale, or the subset. We tell a story from data that resists tidy storytelling. Communication is…
Self-balancing bikes seem to defy physics, but they’re actually powered by the non-intuitive physics of gyroscopes.
The limits of motion in the 3-body problem make sense when you visualize them like a waterline. Thanks to @HopDavid41 for this inspired cartoon, turning a tricky concept into something we all understand: a duck pond.
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:…
A planet on a looping dance between two stars: circling the big one, then both, in between briefly caught by the smaller one.
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:…
What if Juno left Jupiter to get a closer look at interstellar comet 3I/ATLAS? With a couple of burns, Juno can get as close as 25 million km. Purely hypothetical, fun orbital mechanics! 🔭 Thanks @hibberdadam994 @I4Interstellar for the research and trajectory data.
A rare visitor from another star. ESA's Mars orbiters just captured the first images of interstellar comet 3I/ATLAS, only the third ever seen after ʻOumuamua and Borisov. Born before our Solar System, now passing through it.
☄️ #3I/ATLAS comet update! On 3 October, our ExoMars Trace Gas Orbiter (TGO) turned its eyes towards interstellar comet 3I/ATLAS as it passed close to Mars. Together with Mars Express, ExoMars TGO had the closest view of the comet of all of our spacecraft. It looked towards the…
A reminder of how dynamic near-Earth space really is. And how much of it we’re still discovering.
10 #asteroids passed closer than the Moon in a 5-day period from September 23-28. All were discovered this month. The largest up to 41 meters wide. #astronomy
An Earth–Moon multi-orbiter cycler: stable, repeating, and periodic in both rotating and inertial frames. This rare dual-periodic orbit loops Earth multiple times, then the Moon, repeating every 109 days, no propulsion required. 👉🏽Details in the paper: tinyurl.com/cyclerpaper
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:…
Whatever children do when learning language, it isn’t what machines do. No vast archive, no brute-force statistics. Our minds work in leaps, not averages. We don’t compute reality. We grasp it.
🚨 Our latest paper just came out in Science, where we report a simple, historical pattern: From 1980 to 2020, Republican lawmakers consistently funded science at a higher level than their Democratic counterparts. four years in the making. Led by @zfurnas thread 1/n
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