Space 01
How a dip in starlight reveals an exoplanet’s size
Infer a planet-to-star radius ratio from a transit light curve, compare Earth and Jupiter signals, and explore why grazing transits need more care.
Space
Space 02
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 03
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 04
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 05
Why massive stars live fast: mass, lifetime and stellar remnants
Estimate main-sequence lifetimes from mass and luminosity, read an H–R diagram, and distinguish schematic evolution paths from detailed stellar predictions.
Space 06
Why planets lose atmospheres: gravity, temperature and molecular speed
Compare escape velocity with a thermal gas distribution, and learn why a fast molecular tail does not directly give an atmospheric lifetime.