The red planet's hot again, cold again history: Explaining persistent hydrogen in Mars' atmosphere
The fact that the cold, dry Mars of today had flowing rivers and lakes several billion years ago has puzzled scientists for ...
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Supermassive black holes in 'little red dot' galaxies are 1,000 times larger than they should be, and astronomers don't know why
"Our measurements imply that the supermassive black hole mass is 10% of the stellar mass in the galaxies we studied." ...