Rafi Letzter

Neutron stars are like the most efficient thermoses in the universe, filled with hot noodle soup. Here's how, over the course of millions of years, they cool down.

Back in 2016, researchers claimed Dragonfly 44 was a "failed" Milky Way — a galaxy with a huge dark matter mass but almost no stars. Now, on closer examination, that claim has fallen apart.

A new test of Albert Einstein's theory of general relativity has proved the 20th Century physicist right again, this time using a supermassive black hole.

Something pulled the outer layer of Cassiopeia A off before it detonated to form this gorgeous supernova. But what?

Something is showering gold across the universe. But no one knows what it is, and key theoretical explanations are falling apart

What if scientists had started hunting for life on Venus in 1978?

Tracy Slatyer, known for hunting dark matter in our galaxy and discovering evidence of an ancient Milky Way explosion, has won a $100,000 prize funded by tech billionaires.

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.

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

That's one precise laser shot.

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.

California's Death Valley recorded what may be its hottest ever temperature on Sunday (Aug. 16) — a blazing 130 degrees Fahrenheit (54.4 degrees Celsius).

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.

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.

How much would a report like this really tell us?

What happens when you turn space-time upside-down?

Once again, physicists have confirmed one of Albert Einstein's core ideas about gravity and relativity — this time with the help of a neutron star flashing across space.

A new paper used an advanced "Bayesian" model to show that the emergence of intelligent life on Earth was probably a lucky break.

Eleven billion years ago, a hot, active, eyeball of a galaxy glared across space. It formed in a violent collision, and could help explain the Milky Way's spiral.

There's a microwave power experiment heading to space Saturday (May 16) aboard the Air Force's secretive X-37B spaceplane. Researchers hope it could lead to a new global power source.