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In space, does light travel forever or fade as the universe expands?

Light released by a distant star does not simply wink out after crossing some threshold of space. In a vacuum, photons keep moving indefinitely, and astronomers routinely detect light that has ...
WMNF

Most normal matter in the universe isn’t found in planets, stars or galaxies – an astronomer explains where it is

Mysterious blasts of radio waves from across the universe called fast radio bursts help astronomers catalog matter. ESO/M. Kornmesser, CC BY-SA Chris Impey, University of Arizona If you look across ...
IFLScience

The Universe’s “Red Sky Paradox” Just Got Darker: Most Stars Might Never Host Observers

James is a published author with multiple pop-history and science books to his name. He specializes in history, space, strange science, and anything out of the ordinary.View full profile James is a ...
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Most normal matter in the universe isn't found in planets, stars or galaxies – an astronomer explains where it's distributed

This article was originally published at The Conversation. The publication contributed the article to Space.com's Expert Voices: Op-Ed & Insights. If you look across space with a telescope, you'll see ...