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

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On the atomic or quantum level, what makes Francium so unstable? Its most stable isotope has a half-life of only 22 minutes, meaning that any visible amount would vaporize itself.

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Why is gravity often considered to be the weakest of the fundamental forced when its effects can be felt so far away from the source?

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Would it be possible to perform computation without generating heat? If not, which law of physics prohibits this?

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If we discovered a small black hole with an event horizon of 100 meters accross headed towards Earth, would we be able to move or deflect it as if it were an asteroid?

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Why is elemental transmutation not performed on a regular basis? Is it that hard to change one atom into the atom of a different element?

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We know that the sun has a solar cycle of eleven years. Are there any other longer term cycles that the sun experiences?

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According to Quantum Theory, is it true that if I toss a tennis ball enough times at my wall, eventually it will go right through?

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If there were parallel worlds, and we were somehow able to find a way and communicate with them, would that ability break any known physical laws?

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What is the one thing that absolutely determines if an element or isotope is radioactive or not? What determines the length of the half-time for decay (why does it seem to jump all over the place?)

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Why are children born with Trisomy 21 usually viable but any other trisomy usually ends in miscarriage?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
On the atomic or quantum level, what makes Francium so unstable? Its most stable isotope has a half-life of only 22 minutes, meaning that any visible amount would vaporize itself.	7
Why is gravity often considered to be the weakest of the fundamental forced when its effects can be felt so far away from the source?	7
Would it be possible to perform computation without generating heat? If not, which law of physics prohibits this?	7
If we discovered a small black hole with an event horizon of 100 meters accross headed towards Earth, would we be able to move or deflect it as if it were an asteroid?	7
Why is elemental transmutation not performed on a regular basis? Is it that hard to change one atom into the atom of a different element?	6
We know that the sun has a solar cycle of eleven years. Are there any other longer term cycles that the sun experiences?	6
According to Quantum Theory, is it true that if I toss a tennis ball enough times at my wall, eventually it will go right through?	6
If there were parallel worlds, and we were somehow able to find a way and communicate with them, would that ability break any known physical laws?	6
What is the one thing that absolutely determines if an element or isotope is radioactive or not? What determines the length of the half-time for decay (why does it seem to jump all over the place?)	5
Why are children born with Trisomy 21 usually viable but any other trisomy usually ends in miscarriage?	5