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1,000 pc 3.09×10 16: Projection effect of the Radcliffe wave and Split linear structures , [32] between which the Sun is currently travelling. [33] Orion Arm: 3000 pc (length) 9.26×10 16: The spiral arm of the Milky Way Galaxy through which the Sun is currently travelling. Orbit of the Solar System: 17,200 pc 5.31×10 17
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The spiral arms are colored differently in order to highlight what structure belongs to which arm. H II regions are marked as dots colored in the same color as their spiral arm. They come in three sizes, measured by the excitation parameter U: small - U > 200 pc cm-2; medium - 200 > U > 110 pc cm-2; large - 110 > U > 70 pc cm-2; Date: 9 June ...
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The curvature of the Earth is evident in the horizon across the image, and the bases of the buildings on the far shore are below that horizon and hidden by the sea. The simplest model for the shape of the entire Earth is a sphere. The Earth's radius is the distance from Earth's center to its surface, about 6,371 km (3,959 mi). While "radius ...
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Ignoring the influence of other Solar System bodies, Earth's orbit, also called Earth's revolution, is an ellipse with the Earth–Sun barycenter as one focus with a current eccentricity of 0.0167. Since this value is close to zero, the center of the orbit is relatively close to the center of the Sun (relative to the size of the orbit).