Some people have a habit of going out in their sleep. The interesting thing is that they get out of bed and sometimes change their clothes and go out and the person is still sound asleep. What is sleep? The...
Stephenson 2-18 (St2-18) is a red supergiant star located in the scutum constellation. Also known as Stephenson 2-DFK 1 and RSGC2-18. Stephenson 2-18 is currently the largest known star in the universe. This is also the most luminous red supergiants...
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