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And the earth was without form and void, and darkness was upon the face of the deep. Sometimes, if the night is dark and clear enough, you can look up and see the Milky Way in its arc across the sky.

This article was originally published at The Conversation. The publication contributed the article to Space.com's Expert Voices: Op-Ed & Insights. The size of the solar system is defined by the volume ...

Some 4.6 billion years ago, when the solar system was born from a vast cloud that collapsed to form the sun and a surrounding disk of whirling gas, no planets yet orbited our star. Back then, besides ...

Discover the hottest planet in the solar system, why Venus is hotter than Mercury, planet temperature facts, greenhouse ...

Discover the powerful volcanic eruptions that have shaped worlds across our solar system. Around our solar system, violent eruptions are shaping distant worlds. Discover the explosive forces that ...

West Virginia University’s physics and astronomy department held a free demonstration on campus today. Graduate students in ...

There’s a bit of a paradox about our galaxy: it’s both jam-packed with stars and cavernously empty. The Milky Way is crowded in the sense that it holds hundreds of billions of stars, as well as ...