A common height that seems normal in our human-scale world. Yet, when we compare it to the smallest and largest conceivable ...

Distance scales from the Planck length to a 93-billion-light-year observable universe expose extreme limits of physics and hint at unknown phenomena where current laws break down.

Could our universe be expanding then shrinking back into a tiny point, reliving a kind of big bang over and over again? Probably not, according to a mathematical analysis that argues that the laws of ...

How did the universe come into being? There are a multitude of theories on this subject. In a Physical Review Letters paper, three scientists formulate a new model: according to this, inflation, the ...

We aren’t sure if [Looking Glass Universe] didn’t trust the accepted number for Planck’s constant, or just wanted the experience of measuring it herself. Either way, she took some LEDs and worked out ...