Stellar physics and cosmology
Calculate the radiation pressure exerted by light, both outside a star (from its luminosity and your distance) and inside…
Calculate the speed of a Star Trek starship from its warp factor using the TOS (v = w³) and two TNG (v = w^10/3) equations.…
Create your own universe and watch how it evolves. Set the Hubble constant and the matter, radiation, and dark energy densities…
Calculate the recession velocity, distance, and redshift of a galaxy using Hubble's law (v = H₀ × d). Enter distance, velocity,…
Calculate the distance to nearby stars using the stellar parallax method. Enter the parallax angle in arcseconds or milliarcseconds…
Calculate the Hawking (black body) temperature of a black hole from its mass: temperature in kelvin and °C/°F, Schwarzschild…
Calculate the results of two black holes colliding: chirp mass, symmetric mass ratio, mass radiated as gravitational waves,…
Calculate the distance light travels in any time period — seconds, minutes, hours, days, months, or years. Convert results…
Calculate the luminosity of any star using the Stefan-Boltzmann law. Find luminosity in watts and solar units, absolute magnitude,…
Calculate the Schwarzschild radius (event horizon) and surface gravity of a black hole from its mass. Supports metric and…
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