Rafi Letzter

Marco's rainfall and flooding will make Laura's even more serious.

There's no record of two hurricanes being in the Gulf of Mexico at the same time. Next week, that could change.

A small, soft smacked into Costa Rica on April 23, 2019. And it carried dust older than our sun, as well as clues regarding how life formed on Earth.

The idea that interstellar object 'Oumuamua is a hydrogen iceberg has a flaw.

The American southwest is cooking.

Astronomers have bounced lasers of mirrors left by Apollo astronauts on the lunar surface for decades. But this is the first time bouncing one off a lunar orbiter — after a decade of trying.

Vast lava tubes pock the surface of the moon and Mars, and could protect explorers from the elements. But first someone needs to explore them.

SpaceX and United Launch Alliance will share the job of launching the Pentagon's most important military equipment from 2022 to 2026.

A new experiment on ultra-rare astatine could open the door to cancer treatments and new research into super-heavy atoms.

Tens of thousands of planets like Earth and Neptune might orbit the giant black hole at the center of the Milky Way.

SpaceX's Demo-2 test flight ended in the Gulf of Mexico today, about two months since its launch opened the era of commercial crewed spaceflight.

The microbes had been dormant below the ocean floor for eons, buried since the time of the dinosaurs. Then a team of scientists in Japan woke the little organisms up.

The comet NEOWISE is visible in the dawn sky right now, but photographers are facing a new challenge when they try to capture it: the SpaceX fleet of Starlink satellites.

The U.S. government says Russia tested an anti-satellite space weapon July 15. Russia says it was an inspector satellite. Nothing was destroyed.

Telescopes all over the world watched a bright flash light up space around a distant, supermassive black hole. And then, within hours, it was gone.

The United Arab Emirates' probe Hope is on its way to Mars, marking the first planetary science mission led by an Arab country. Here's why.

After the Bighorn Fire burned a large area near Pima County, Arizona, a river of dark sludge rushed toward town.

New research re-examining old data showed that 28 objects previously described as distant galaxies or dim black holes are in fact bright, shrouded supermassive black holes.

One of the most important controversies in physics remains unresolved after a major new study. But at least we have a new precise number for the universe's age.

Physicists are step closer to understanding where the largest black holes in the universe came from. But new data reveals even deeper mysteries around their creation.

The high Presena glacier has turned pink in a major bloom of dangerous, ice-melting algae.

Trump threatened in May to withdraw the U.S. from the WHO. Now the process has begun.

Air quality could reach dangerous levels across a wide chunk of the continental U.S. and Caribbean this weekend as a rare, giant Saharan dust storm reaches the U.S.

The US Senate intelligence committee plans to impose new rules on how the Department of Defense (DOD) shares information about UFOs, and to demand a public report on what the DOD knows so far.

Most diamonds originate at the bottoms of tectonic plates. But the giant blue Hope and Cullinan diamonds may have originated far deeper within the planet.