/u/poptart2nd's posts in /r/askscience

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As i understand it, interplanetary rovers operate until they break or until their solar panels can no longer charge their batteries. to the second point, why don't they design the rovers with a way to clean the solar panels?

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Where do large nebulae such as the Eagle Nebula come from and why haven't they collapsed into stars yet?

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For artillery rounds that explode on impact, how does the round "know" the difference between hitting the ground and being fired out of a barrel?

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How is the sea level determined on planetary bodies where there is no liquid present, such as the moon?

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If photons have no mass, why are they affected by gravity?

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This video shows liquid helium boiling. As it boils, it cools down. why does it cool down?

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what causes us to get songs stuck in our head? Is there any way to get it "unstuck?"

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If I were in an airtight room, how much plant matter would need to be in the room to maintain a stable level of oxygen?

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how the hell does the "rubber pencil trick" work?

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Is there an electromagnetic wavelength that is longer than radio waves or shorter than gamma waves?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
As i understand it, interplanetary rovers operate until they break or until their solar panels can no longer charge their batteries. to the second point, why don't they design the rovers with a way to clean the solar panels?	5
Where do large nebulae such as the Eagle Nebula come from and why haven't they collapsed into stars yet?	5
For artillery rounds that explode on impact, how does the round "know" the difference between hitting the ground and being fired out of a barrel?	2
How is the sea level determined on planetary bodies where there is no liquid present, such as the moon?	2
If photons have no mass, why are they affected by gravity?	2
This video shows liquid helium boiling. As it boils, it cools down. why does it cool down?	2
what causes us to get songs stuck in our head? Is there any way to get it "unstuck?"	1
If I were in an airtight room, how much plant matter would need to be in the room to maintain a stable level of oxygen?	1
how the hell does the "rubber pencil trick" work?	1
Is there an electromagnetic wavelength that is longer than radio waves or shorter than gamma waves?	1