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The oldest known star has recently been discovered. Scientists believe it is ancient because of its low iron content. Why do old stars have a low iron content?

866 upvotes • Koeny1

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FAQ Friday: Pi Day Edition! Ask your pi questions inside.

866 upvotes • AskScienceModerator

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Can a group of asteroids form and maintain an atmosphere? Are there any existing asteroid clusters like this?

866 upvotes • pipsdontsqueak

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For the universe, if the Big Bang were 12:00:00 on Jan 1, and the theorized Heat Death were 11:59:59 on Dec 31, what day/time is it now?

865 upvotes • hairy_butt_creek

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Why can’t a human body heal teeth in case if it breaks or there is a cavity?

865 upvotes • rahul1739

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Why is it possible to freeze semen and then have it function properly when thawed?

864 upvotes • Tredronerath

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Gravity and time dilation?

864 upvotes • DownFalldotcom

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In this photo of a nuclear explosion, why is it not uniform? [Photo]

863 upvotes • [deleted]

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How come when I breathe in through my nose I'm able to smell the odors around me but when I exhale through my nose I don't smell my breathe or any of the odors inside my body?

863 upvotes • KingOfKrackers

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How has life affected what the Earth looks like?

863 upvotes • aSemy

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
The oldest known star has recently been discovered. Scientists believe it is ancient because of its low iron content. Why do old stars have a low iron content?	866	Koeny1
FAQ Friday: Pi Day Edition! Ask your pi questions inside.	866	AskScienceModerator
Can a group of asteroids form and maintain an atmosphere? Are there any existing asteroid clusters like this?	866	pipsdontsqueak
For the universe, if the Big Bang were 12:00:00 on Jan 1, and the theorized Heat Death were 11:59:59 on Dec 31, what day/time is it now?	865	hairy_butt_creek
Why can’t a human body heal teeth in case if it breaks or there is a cavity?	865	rahul1739
Why is it possible to freeze semen and then have it function properly when thawed?	864	Tredronerath
Gravity and time dilation?	864	DownFalldotcom
In this photo of a nuclear explosion, why is it not uniform? [Photo]	863	[deleted]
How come when I breathe in through my nose I'm able to smell the odors around me but when I exhale through my nose I don't smell my breathe or any of the odors inside my body?	863	KingOfKrackers
How has life affected what the Earth looks like?	863	aSemy