A triple star system puts Einstein’s theory of gravity to the test.
How To Weigh A Star
How do we know the gravity of a single star?
Measuring The Universe With Gravitational Waves
The recent merger of two neutron stars produced both visible light and gravitational waves, and that lets us determine just how fast the universe is expanding.
The Eclipse And The Pendulum
In 1954 an economist did a physics experiment, and the resulting controversy raged for decades.
Black Hole Dance
The VLBA has observed two supermassive black holes orbiting each other in a gravitational dance.
The Attraction Of A Star
New observations of a white dwarf prove Chandrasekhar’s model right using an experiment of his most bitter rival.
Black Holes And Gravitons
The latest detection of gravitational waves shows the power of gravitational astronomy, and lets us study aspects of quantum gravity.
The Dark Web
A study of thousands of galaxy pairs shows dark matter filaments exist between galaxies.
Emergence Of Gravity
A new solution to dark matter argues that gravity is not a fundamental force, but rather an emergent property of entropy.