Fact or fiction? Either way, an alien still seems menacing.
Cindy Zhi/The Conversation
Stephen Hawking raised the public profile of grand science, and speculated about the future of artificial intelligence, as well as contacting aliens. Does science mix easily with science fiction?
The Milky Way seen in infrared.
NASA/JPL-Caltech/S. Stolovy (SSC/Caltech)
There could be thousands of black holes at the heart of the Milky Way.
What goes in doesn’t go out?
The famous cosmologist was closely identified with black holes due to his revolutionary theoretical work explaining some of their mysterious properties.
Stephen Hawking both warned about and benefited from artificial intelligence.
Despite his fears artificial intelligence might one day overtake humanity, Stephen Hawking knew from his own life how profoundly AI could improve humans' daily lives.
UK's Astronomer Royal Martin Rees shares his memories of the physicist Stephen Hawking, who has died at the age of 76.
British theoretical physicist and cosmologist, Professor Stephen Hawking in 2014.
Stephen Hawking inspired people with his work on black holes and other mysteries of the universe. Many were quick to pay tribute to the theoretical physicist who died today in the UK, aged 76.
Stephen Hawking at Gonville & Caius College, Cambridge in 2015.
Hawking's most famous book, A Brief History of Time, sold 10 million copies and was translated into 40 languages, skyrocketing to the top of the bestseller lists in the US and UK.
ns gw art.
From a slow hum to a chirp or a bleep, what is that sound you hear whenever there's a new detection of gravitational waves?
Jets from Centaurus A.
ESO/WFI (Optical); MPIfR/ESO/APEX/A.Weiss et al. (Submillimetre); NASA/CXC/CfA/R.Kraft et al. (X-ray
Jets from supermassive black holes behave in mysterious ways. Now scientists have now worked out what's really going on.
An artist’s impression of a supermassive black hole at the centre of a galaxy.
Black holes may come in many sizes, but there's still a gap in the middle. The hunt is on to solve the mystery of where are the intermediate size black holes.
Andy Rain/ EPA
Hawking proved that the Big Bang was physically possible.
Artist’s impression of the collision of two neutron stars, the source of the latest gravitational waves detected.
National Science Foundation/LIGO/Sonoma State University/A. Simonnet
Astronomers have finally confirmed the source of the latest detected gravitational waves was the collission of a pair of neutron stars, what they'd been searching for all along.
The Australia Telescope Compact Array in Narrabri, NSW.
All it took was a single email alert to send the world's astronomers searching for the source of the latest gravitational wave detected.
The Zadko telescope was set to study the optical glow following a gamma ray burst.
Efforts to see the afterglow from a neutron star merger were nearly thwarted by bad weather and a cyber attack on an Australian telescope.
Virgo detector in Italy.
New results from Italy and the US help us better estimate the position of the merging black holes that produced the gravitational waves.
Black hole collision and merger releasing gravitational waves.
New research shows that as few as ten further detections of gravitational waves will help scientists know for sure how pairs of black holes form.
A simulation of the latest binary black hole merger detected by LIGO. Blue indicates weak fields and yellow indicates strong fields.
Numerical-relativistic Simulation: S Ossokine, A Buonanno (Max Planck Institute for Gravitational Physics) and the Simulating eXtreme Spacetime project Scientific Visualization: T Dietrich (Max Planck Institute for Gravitational Physics), R Haas (NCSA)
Scientists have made a third detection of gravitational waves, again caused by the merger of two black holes. But they think there's something different about the black holes in this case.
Artist’s conception of two merging black holes, spinning in a nonaligned fashion.
LIGO/Caltech/MIT/Sonoma State (Aurore Simonnet)
These ripples in the very fabric of the universe were hypothesized by Einstein a century ago. Now scientists have detected them for the third time in a year and a half – ushering in a new era in astrophysics.
When black holes collide, gravitational waves are created in space itself (image is a computer simulation).
The SXS (Simulating eXtreme Spacetimes) Project
Einstein called entanglement "spooky action at a distance”. But now it's been used to design an incredibly sensitive detection method for gravitational waves.
An artist’s rendering of the Swift satellite catching a Gamma-ray Burst.
A burst of gamma rays in a distant part of the universe reveals the birth of another black hole.