Space 01
Is Kessler Syndrome Real? Gravity's Debris vs Reality
Is Kessler syndrome real? Yes, but it unfolds over decades, not Gravity's 90 minutes. Real debris counts, collision speeds and impact energies, computed.
orbits
Space 02
3 Body Problem: The Real Physics of Trisolaris
We simulate a real three-body system in Python, show how chaos ends Trisolaris's stable eras, and explain why the real Alpha Centauri is calm.
Space 03
How We Know 3I/ATLAS Is Interstellar: Orbit Math
3I/ATLAS has eccentricity 6.1 and leaves at 58 km/s. We compute its orbital energy, compare 'Oumuamua and Borisov, and show why no planet could fling it.
Space 04
Why Is James Webb at L2? The Physics, Computed
Webb orbits L2, 1.5 million km out, so Sun, Earth and Moon stay on one side. L2 isn't where gravity cancels, and sitting at it means an endless eclipse.
Space 05
Is There Gravity on the ISS? Yes: 89% of Earth's
Gravity at the ISS is 89% of Earth's surface value. Astronauts float because they fall 4.35 m every second and keep missing. Here are the numbers.
Space 06
How gravity assists speed up or slow down a spacecraft
Resolve the gravity-assist puzzle by comparing planet-relative and Sun-relative velocities during a simplified Jupiter flyby.
Space 07
Lagrange points explained: the geometry behind JWST and Aditya-L1
Understand the five rotating-frame equilibrium points, why L1 and L2 need station keeping, and what makes L4 and L5 different.
Space 08
Orbital resonance and repeating alignments: what a period ratio tells you
Explore 2:1 and 3:2 orbital rhythms, calculate radius ratios with Kepler’s law, and learn why a simple period match does not prove dynamical resonance.
Space 09
Why moons break apart: the Roche limit and planetary rings
Follow a density-based worked example of the Roche limit, then test when an icy or rocky moon crosses a tidal-disruption boundary.
Space 10
Why planets seem to move backward: retrograde motion explained
Use Earth’s moving viewpoint to explain Mars, Mercury and Venus retrograde motion, with a worked synodic-period example.