Orbits, gravity, stars and cosmology
Minimum speed to escape a body's gravity.
Speed of a circular orbit.
Relates orbital period to semi-major axis.
Event horizon radius of a black hole.
Recession velocity of galaxies with distance.
Luminosity of a star from radius and temperature.
Fractional wavelength shift of light.
Distance in parsecs from parallax angle in arcseconds.
Gravitational acceleration at a body's surface.
Observed brightness from luminosity and distance.
Relates apparent and absolute magnitude to distance.
Distance light travels in a given time.
Peak emission wavelength of a blackbody.
The attractive force between any two masses.
Energy of a mass in another body's gravitational field.
How a main-sequence star's brightness scales with its mass.
The maximum steady luminosity before radiation blows a star apart.
The maximum mass of a stable white dwarf.
Temperature of the radiation a black hole emits.
Radius where gravity bends light into a circular orbit.
Time between repeated alignments of two orbiting bodies.
Fractional stretching of light climbing out of gravity.
The zone where a body's gravity dominates over its host's.