General Relativity
New Simulation Offers Stunning Images of Black Hole Merger
A black hole is an extraordinarily massive, improbably dense knot of spacetime that makes a living swallowing or slinging away any morsel of energy…
How We Know Gravity is Not (Just) a Force
When we think of gravity, we typically think of it as a force between masses. When you step on a…
Millisecond Pulsar Discovered In Rare Triple Star System
If you’re looking for something truly unique, then check out the cosmic menage aux trois ferreted out by a team…
Book Review: Time Reborn
Time Reborn: From the Crisis of Physics to the Future of the Universe is one of those books intended to…
Weekly Space Hangout – April 26, 2013
We had an action packed Weekly Space Hangout on Friday, with a vast collection of different stories in astronomy and…
Black Hole Jets Might Be Molded by Magnetism
Visible-light Hubble image of the jet emitted by the 3-billion-solar-mass black hole at the heart of galaxy M87 (Feb. 1998)…
Antigravity Could Replace Dark Energy as Cause of Universe’s Expansion
[/caption] Since the late 20th century, astronomers have been aware of data that suggest the universe is not only expanding,…
Astronomy Without A Telescope – Unreasonable Effectiveness
[/caption] Gravitational waves are apparently devilishly difficult things to model with Einstein field equations, since they are highly dynamic and…
Message in a Wobble: Black Holes Send Memos in Light
[/caption] Imagine a spinning black hole so colossal and so powerful that it kicks photons, the basic units of light,…
How Fast Does Light Travel
[/caption] One of the most interesting constants and challenges in physics is the speed of light. The speed of light…