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754 tools
Estimate how efficiently an engine generates thrust using the specific impulse calculator.
Use our synodic period calculator to determine the synodic or the sidereal periods of a planet.
Estimate the thrust-to-weight ratio for real aircraft or your designs using the thrust-to-weight ratio calculator.
Use the UFO travel calculator to design a fast-moving UFO and estimate its performance.
The Black Hole Collision Calculator lets you see the effects of a black hole collision, as well as revealing some of the mysteries of black holes, come on in and enjoy!
Use the black hole temperature calculator to learn the black body temperature of a black hole from just its mass.
Where is everybody? Learn how to calculate the probability of another civilization existing somewhere in our Galaxy with Omni's Drake equation calculator.
Come on into the Hubble law distance calculator where you can find the answers for the questions like what is the Hubble's Law and what is the value of the Hubble constant.
The luminosity calculator finds a star's luminosity, absolute magnitude, and apparent magnitude.
Why is the night sky dark, only dotted with shiny stars? Olber's paradox is a titillating problem with a clear and satisfying solution.
Use the parallax calculator to determine the distance between the earth and the stars.
Use the radiation pressure calculator to find the pressure that arises from electromagnetic radiation.
With our redshift calculator, you can determine the magnitude of redshift – an interesting phenomenon in astrophysics.
Calculate the gravitational acceleration at the event horizon of a black hole of a given mass using the Schwarzschild radius calculator.
Create your own Universe with this Universe Expansion calculator
The barn-pole paradox is an interesting thought experiment in relativity that showcases the quirkiness of our Universe!
Is the bug going to make it out alive? We're not sure: after all, it's fighting against Einstein. Solve with us the challenging bug-rivet paradox!
The electron speed calculator helps you estimate both the classical and relativistic speeds of an electron.
Explore Einstein's famous E=mc² equation with our calculator and understand the mass-energy equivalence easily.
With this gravitational time dilation calculator you can check how much time slows down by near big objects.
Discover how length is relative to the point of view with our calculator, exploring the relativity of length in physics accurately and easily.
The relativistic kinetic energy calculator finds the kinetic energy of an object traveling at a speed similar to the speed of light.
With the space travel calculator, you can plan your journey to another star system or even another galaxy.
Use the velocity addition calculator to discover that we cannot just add the velocities.