Do I need to install anything?

No. It runs in any modern browser, free, with no account required.

For Researchers · Hubble's Law

Hubble's Law for a binary star

Built for researchers prototyping or validating an idea. Prototype fast, reproduce exactly, and share a citable, interactive version of your model. Simulate a binary star live below — adjust the inputs and watch it respond, right in your browser.

Hubble's Law & RedshiftLive

the expanding universe

Controls

Presets

Hubble constant H₀ (km/s/Mpc)

Every distant galaxy recedes at a velocity proportional to its distance: v = H₀·d. This uniform expansion is the same seen from any galaxy — there is no center. The inverse of H₀ gives the Hubble time, a rough estimate of the age of the universe.

▶ Run in Python

Data Inspector

H₀70 km/s/Mpc

Hubble time14.0 Gyr

v at 100 Mpc7,000 km/s

Governing equation

v = H_{0} d = 70 \times 100 = 7, 000 km/s, t_{H} = \frac{1}{H _{0}} \approx 14.0 Gyr

Reading this result: Right in the Hubble-tension zone: this H₀ gives a Hubble time of 14.0 Gyr, close to the measured 13.8-Gyr age of the universe.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

or unlock everything with Pro →

Also for:Students Educators Engineers Hobbyists & Makers K-12 Students First Responders General version →

More with Hubble's Law

Hubble's Law for a planet orbit Hubble's Law for a black hole Hubble's Law for a galaxy rotation Hubble's Law for a comet path Hubble's Law for a solar eclipse Hubble's Law for a supernova Hubble's Law for a star's life Hubble's Law for an exoplanet transit

Frequently asked questions

Is this good for researchers?: Yes — this version of "Hubble's Law for a binary star" is framed for researchers prototyping or validating an idea. Prototype fast, reproduce exactly, and share a citable, interactive version of your model.
Do I need to install anything?: No. It runs in any modern browser, free, with no account required.