askscience

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I know the laws of physics change from classical physics to quantum as things get incredibly small, BUT how is physics handled at the size between the two? Is there are "hard" size that instantly makes it quantum or is there a gray area. How is physics handled in this area?	1
What is the fastest moving object in the universe? Is it possible there are unknown particles with mass that travel near the speed of light, experience time dilation where a moment to it is thousands or more years in our time and that's why we can't detect it? Could this explain "dark" matter?	1
If "normal" matter makes up less than 5% of the entire "observable" universe relative to Dark Energy/Matter, couldn't the age of the universe be significantly higher than 13.7billion years old since it's calculated via observable expansion rate?	1
Part of potentially sending people to live on Mars is to grow their own food. How do we know the soil doesn't have harmful toxins that can be taken up by the plants we potentially grow there?	1
If the light we are receiving from distant galaxies is literally millions or even billions of years old, then how is the Fermi Paradox even a valid proposition as there could be intelligent civilizations in the exact same spot at current time that has developed since then?	1
Are supermassive blackholes so dense that they are "rooted" in place or do they move with the plane of the system they are in?	1
What is going on chemically / electrically / hormonally when human beings are estimating time? What is actually going on when we estimate time and how accurate are we?	1
Do some animals know expression of "sorry"? I've accidentally stepped on a pet and said "sorry" and showed empathy and they seemed to do better.	1
Why does SETI require a signal to repeat to authenticate it as potential legit alien signal? You could easily make a case for a legit non repeating alien signal akin to a car driving past you with the radio on and you hear it once and never see that moving car again.	1
One small bedroom and one open window. What cools a room better? A single fan sucking in cool air or same fan pointed out blowing out the hot air?	1

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