Line Earth up against Jupiter and the giant’s equatorial width is roughly eleven times ours — a disk so wide that a jet flying nonstop would need weeks to circle it once.
That span is mostly hydrogen and helium atmosphere wrapping a denser interior. Diameter makes Jupiter look like a failed star’s little cousin in silhouette, even though it never ignited fusion.
Width is the first shock of planetary scale. Eleven Earths across turns “gas giant” from a label into a measurable sky-filling ball.
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