the.com/gravity
the universe's clingiest force, too weak to win an arm-wrestle yet bossing entire galaxies around
means The force by which objects with mass attract one another, keeping us on the ground and the planets in their orbits; also, figuratively, seriousness or weighty importance.
from From Latin gravitas, meaning weight, heaviness, or dignity, from gravis, "heavy" — a root with cousins across Indo-European languages (Greek barys, "heavy," is a distant relative). For centuries the word carried mostly the figurative sense — a person of gravity was solemn and important — before science borrowed it to name the literal pull that makes heavy things fall.
- weakest force
- a fridge magnet beats Earth's entire pull
- time bender
- clocks run slower near massive objects
- wave maker
- detected by ripples in spacetime in 2015
- falling speed
- a feather and hammer drop equally in vacuum
- never off
- reaches across infinite distance, just fading forever
gravitational wave detection — ligo detected merging black holes 1.3 billion light-years away on september 14, 2015
gravitational lensing — einstein ring around galaxy sdssj0946+1015, light bent by massive galaxy cluster
chandrasekhar limit — maximum mass of white dwarf star before collapse to neutron star: 1.4 solar masses