Physics

In recent years astronomers made the puzzling discovery of two bizarre galaxies with almost no dark matter, which should dominate them. Now, a new study has suggested an explanation for that mystery – a larger nearby galaxy is stripping it away.

Exactly why and how the expansion of the universe is accelerating remains unknown. One hypothesis blames strange black-hole-like objects made of dark energy, and now astrophysicists have theorized how these objects work and where they all went.

The LIGO and Virgo Scientific Collaboration has detected gravitational waves coming from the most massive black hole collision that it's ever recorded. The end result created a gargantuan black hole that belongs to a new class.

The Super-Kamiokande neutrino observatory in Japan has received an upgrade. A rare-earth element called gadolinium has been added to the water in the facility, which will make it more sensitive to neutrinos from more distant and ancient supernovae.

After a two-year shutdown for repairs and upgrades, CERN’s Large Hadron Collider is beginning to fire back up. The newest particle accelerator, Linac 4, completed its first test run over the past few weeks, and will produce much more powerful beams.

Time crystals are strange phases of matter that appear to break time-translation symmetry. Now scientists have observed two time crystals interacting for the first time, which could be a step towards practical applications like quantum computing.

A seven-year global effort has used almost 15,000 samples from a variety of sources to draw new, more accurate calibration curves to enable more precise radiocarbon dating of objects as old as 55,000 years.

An extensive search for a hypothetical particle has turned up empty. The sterile neutrino is a proposed subatomic particle that could even be a candidate for the mysterious dark matter, but two new experiments have all but ruled it out.

Scientists have created a new class of laser beam that appears to violate long-held laws of light physics. Known as “spacetime wave packets,” these lasers follow different rules of refraction, which could lead to new communication technologies.

The universe likes to play coy about its age, but we have a pretty good idea of the range. Now, a series of new studies has investigated the question using different methods, and have reached different answers, separated by more than a billion years.

Which time travel movie got the rules right? According to experiments using a quantum time travel simulator, reality is “self-healing,” so changes made to the past won’t drastically alter the future you came from – at least, in the quantum realm.

“Strange metals” exhibit some unusual conductive properties and surprisingly, even have things in common with black holes. Now, a new study has characterized them in more detail, and found that strange metals constitute a new state of matter.