Here are our picks for the most amazing space photos of the week.
Gravitational waves are ripples in space-time created by the interaction of massive objects in space, such as black holes and neutron stars. Their existence was first predicted by Albert Einstein in his 1916 paper describing his theory of general relativity. In 2015, scientists made the first detection of gravitational waves, observing ripples from the collision of two black holes. The discovery won astrophysicists Kip Thorne, Barry Baris and Rainer Weiss the 2017 Nobel Prize for Physics. Subsequent observations have also detected gravitational waves from colliding neutron stars. Learn more about gravitational waves here.
Astronomers have apparently spotted another epic neutron-star crash — and they didn't need gravitational waves to do it.
Analyzing ripples in the fabric of space and time created by pairs of dead stars may soon solve a cosmic mystery surrounding how quickly the universe is expanding — if scientists are lucky.
Four new gravitational-wave observations mean scientists can start to make broader discoveries about the world around us and the black holes that fill it.
Once again, a decades-old theory of gravity has survived a modern scientific onslaught. Einstein wins again.
The historic neutron-star crash that astronomers observed last year generated a hypermassive, supermagnetic neutron star, a recent study suggests.
The collision of black holes harboring millions or billions of times the mass of the sun are likely common throughout the universe, a new study suggests.
Cataclysmic mergers of the superdense stellar corpses known as neutron stars may be common across the cosmos, a new study suggests.
So far, gravitational waves have found no hints of extra dimensions, but there may still be some really tiny ones lurking out there.
The dramatic neutron-star merger that astronomers observed in August 2017 generated a jet of material that seemed to move four times faster than light, a new study reports.
Close encounters with medium-size black holes can reanimate dead stars, if only momentarily, a new study suggests.
The first-ever observations of merging binary stars stunned the astronomy community last year, but not quite as much as the first-ever signal from extraterrestrial life might someday stun the world.
If music really is a universal language, we can use it to make some long-sought cosmic connections. That's the idea behind Intergalactic Omniphonics, a new art project that aims to catch E.T.'s ear.
A so-far unseen celestial collision could be astronomers' best bet for figuring out just how quickly the universe is expanding.
The discovery of a cosmic-ray source is a triumph of multimesssenger astronomy, in which scientists use multiple types of signals to probe deep cosmological questions.
As good skeptics, we shouldn't immediately believe general relativity's tangle of mathematics at first blush. Instead, we need evidence. Good evidence.