Skip to main content

Big Bang Evidence Explorer

Investigate the astronomical evidence supporting the Big Bang Theory.

Redshift and the Expanding Universe

Observe galaxies receding from Earth. Their light spectra are shifted towards the red end, indicating they are moving away. Faster moving galaxies exhibit a greater redshift.

Click a galaxy to view its spectrum, then click "Record Data".

Your browser does not support the canvas element. This is an interactive visual representation of galaxies expanding from a central observer.

Hubble's Law Data

Your browser does not support the canvas element. This is a scatter plot showing the relationship between galaxy distance and velocity.
Galaxy Distance (Mpc) Velocity (km/s)

Composition of Matter

The Big Bang Theory predicts that the early universe was hot and dense enough for nuclear fusion to occur for a brief period. Big Bang Nucleosynthesis created mostly Hydrogen (~75% by mass) and Helium (~25%), with trace amounts of Lithium. Stars later fused heavier elements.

Click to Analyze Sample

Analysis Status

Waiting for sample...

Matter Distribution (By Mass)

Your browser does not support the canvas element. This chart displays the mass distribution of Hydrogen, Helium, and trace elements.

Cosmic Microwave Background (CMB)

The CMB is the remnant radiation from the hot, dense early universe. As the universe expanded, this radiation cooled and its wavelength stretched into the microwave spectrum we observe today at ~2.7 Kelvin.

Observable Universe Model

Temperature: ~3000 K

Radiation Spectrum Peak

Peak Wavelength: 970 nm (Infrared)

Note: As the universe expands, the peak wavelength shifts from infrared to microwave, and the temperature drops according to Wien's displacement law.