Tag
#gravity
4 articles
Astronomy & Cosmology
Orbital Mechanics: The Art of Falling Sideways
Why astronauts float despite full-strength gravity, why reaching orbit means going sideways not up, and why a higher orbit is a slower one.
10 minAug 24, 2026
Physics
General Relativity: Gravity as Curved Spacetime
Einstein's 1915 theory recasts gravity as the curvature of spacetime: mass-energy bends geometry, objects follow geodesics, and clocks, light, and GPS all obey.
10 minAug 19, 2026
Astronomy & Cosmology
Tidal Forces: Why the Moon Raises Two Bulges
Why the Moon raises two ocean bulges (not one), why its weaker pull beats the Sun's, and how the same 1/r³ stretch locks moons and shatters them at the Roche limit.
10 minJul 15, 2026
Astronomy & Cosmology
The Life Cycle of Stars
How a collapsing cloud of gas becomes a star, why its mass decides everything — including the surprising fact that the biggest stars die youngest — and how it ends.
10 minJul 5, 2026