Stephanie Pappas

The SR-71 Blackbird hypersonic spy plane may be back and faster than ever.

The mysterious Hypatia stone fits no known profile.

In a new episode of "Favorite Places," Hawking wonders if humans will understand existence before destroying themselves.

It was a good year for a very bad conspiracy theory.

The evidence suggests the discovery of aliens would not cause panic.

A conference aimed at disputing the idea that the world is round just wrapped up in North Carolina. Here's what they talked about.

Humans are causing the globe to heat up, with dire consequences, according to a climate report from the Trump administration.

A warm Antarctic stratosphere kept the ozone hole small in 2017.

But does this empty space mean anything?

Aliens may have something in common with life on Earth.

A possible reference to a solar eclipse in the Bible could help pinpoint the reign of Ramesses the Great.

These upside-down canyons could contribute to the melt and collapse of Antarctica's floating expanses of ice.

The differentiation of oceanic and continental crust could date back 3.5 billion years.

Solar storms in 2016 may have scrambled the magnetic field sperm whales use to navigate.

A solar flare and potential coronal mass ejection could black out some communications.

Shots of the solar eclipse reveal an active sun.

A test at a SpaceX facility nets a German team top prize.

A curling tongue of clouds reaches out to taste the Iberian Peninsula in a new satellite image.

A ridiculous hoax paper mixing up mitochondria with 'Star Wars' midi-chlorians gets published in four predatory journals.

A new view from space shows Antarctica's newest bouncing baby iceberg. And it's huge.

A seaborne sediment plume turns the Bering Sea green.

It's hard to believe this image was taken over Earth.

The last vestiges of an ancient volcano are visible from orbit.