Rafi Letzter

The device, built to be portable enough for use in space, produces a beam of laser light that changes less over time than any other laser humanity has created.

The 'dark' side of the moon isn't really darker than the 'light side of the moon. But it does appear to get colder at night.

A meteorologist explains the science behind the historic weather event hitting the Midwest and Plains right now.

A laser pulse glanced off a rubidium atom and entered the quantum world — taking on the weird physics of Schrödinger's cat.

There's a new satellite in space, and it was put there to drop "meteors" over the city of Hiroshima.

Back in the first moment of the universe, everything was hot and dense and in perfect balance. A new quantum experiment aims to show how that changed.

China managed to grow some tiny cotton sprouts on the moon, but it killed them. Here's how.

Astronomers barely know anything about dark matter, but now they know this: It behaves differently in old, dying galaxies than in new, star-forming ones.

Physicists have built a ring in which pulses of light whip circles around each other and the normal rules that govern light's behavior stop applying.

Bacteria on the International Space Station are evolving and changing in the strange orbital environment. But they don't seem to be any more dangerous to humans.

China's Chang'e-4 lander contains a living experiment that could lay the groundwork for agriculture at its future lunar base.

As 2019 nears, physicists are hard at work on the next generation of dark matter detectors, and on parsing confusing data from detectors that already exist.

A group of scientists wants to send a nuclear-powered "tunnelbot" to Europa to blaze a path through its thick shell of ice and search for life.

Rosetta's comet sent a magnetic shock wave screaming out in front of it, blazing a trail through the stellar wind. And scientists just found it.

A summertime sparkle seemed to hint that researchers had found dark matter, but it looks like those scientists were wrong.

Silvano Colombano said that his view on aliens visiting Earth “is not accurately represented” in a viral Fox News article.

Churning, hellish, hot-cold gas storms swirl around our universe's supermassive black holes. But the scientists involved in discovering them would prefer you call them "fountains."

Particles: Breathe easy. Scientists at the world's largest particle collider have no plans to smash you together until spring 2021.

A new paper reveals that it would cost less to slow climate change than it would to fix New York City's subway system.

Once again, a decades-old theory of gravity has survived a modern scientific onslaught. Einstein wins again.

A new study reveals the origin of silica, and how a bunch of old supernovas got it all over everything.

Astronomers found a star system in our galaxy that could produce a gamma-ray burst — one of the brightest and most energetic events in the universe.

Why did the European Space Agency create a whole bunch of fake moon dust and use it to 3D print small screws, gears and even a fake coin?

Scientists think there's a 'dark matter hurricane' coming, but it's definitely not going to kill you. It's actually kind of exciting.

As neutrinos pass through the planet, they offer new information on what it looks like inside.