Astronomy

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The Clickable Spacesuit. Distances From the Sun. Dark Matter. Dark Matter - Introduction. When the Universe was young, it was nearly smooth and featureless.

Dark Matter - Introduction

As it grew older and developed, it became organized. We know that our solar system is organized into planets (including the Earth!) Welcome to Cool Cosmos! Orrery_2006.swf from dynamicdiagrams.com. The Scale of the Universe.