/u/[deleted]'s posts in /r/askscience

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Are the emission and absorption spectra of anti-atoms the same as of normal atoms? And if so, how do we know that stars and galaxies far away from us aren't made of antimatter?

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If someone had no idea what cigarettes and tobacco were but somehow became addicted to them, what would they crave?

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How are drugs put through human trials without putting the subjects at risk?

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If photons are massless, why does gravity have an effect on them?

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Will listening to aggressive (or any!) music over a long period of your life alter your hormonal and mental structure?

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The nature of gravity and black holes

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Is it possible for any electric generator to have an efficiency that approaches 100%?

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Is it possible to know if a star no longer exists?

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How does my contact solution work?

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Do the nuclear reactors used in aircraft carriers run out of fuel faster when the ship is being propelled at top speed?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Are the emission and absorption spectra of anti-atoms the same as of normal atoms? And if so, how do we know that stars and galaxies far away from us aren't made of antimatter?	17
If someone had no idea what cigarettes and tobacco were but somehow became addicted to them, what would they crave?	17
How are drugs put through human trials without putting the subjects at risk?	17
If photons are massless, why does gravity have an effect on them?	17
Will listening to aggressive (or any!) music over a long period of your life alter your hormonal and mental structure?	17
The nature of gravity and black holes	17
Is it possible for any electric generator to have an efficiency that approaches 100%?	17
Is it possible to know if a star no longer exists?	17
How does my contact solution work?	17
Do the nuclear reactors used in aircraft carriers run out of fuel faster when the ship is being propelled at top speed?	17