Space
Missing matter mystery in small galaxies
They have a greater proportion of dark to normal matter than larger ones, deepening a puzzle about where the universe's visible stuff is
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They have a greater proportion of dark to normal matter than larger ones, deepening a puzzle about where the universe's visible stuff is
Volcanic glass and vaporised rock found around a young star are thought to be the detritus of a collision between two rocky bodies at least as big as the moon