PLANETARY PERSPECTIVE
Jupiter vs Earth
Width, volume and mass tell three different stories. See both planets on one scale.
See the comparisonSize comparisons you can see.
Put familiar worlds on one scale. Get a clear answer, understand the measurement, then test your intuition in a related game.
ONE SCALE, THREE WORLDS
Sun vs Jupiter
See why about ten times wider means roughly a thousand times the volume.
See the comparisonA MEASUREMENT NEEDS A DATE
The Great Red Spot
Compare dated observations with Earth, and understand why old size claims differ.
See the comparisonWHAT THE NUMBERS MEAN
The same scale. The right question.
Width, area, volume and mass describe different things. Each guide names its measurement, explains the comparison and links to the original sources. Changing observations keep their dates.