Scientists studying the sounds produced by bats has shown that they are amongst the loudest creatures on earth, pumping out 140 dB.
Thankfully, because it's in the ultrasound range, we can't hear it, but if we could it would certainly be an uncomfortable experience. The threshold for human noise-induced pain is about 130dB and, according to the...
A normal star is a big ball of gas, its gravity is pulling it together, trying to make it collapse. It’s actually held up because it’s really, really hot. In the same way that when a gas is hot it expands the star’s temperature allows it to expand and stay fairly big. When the star gets really old it can explode and eventually it has burn most of its ...