Space

Earth

A hundred new nukes?

Here are some issues to contemplate while deciding whether to welcome the nuclear-power renaissance that Sen. Alexander has just proposed.

Space

Pairing off in the early universe

New simulations reveal that some of the first stars in the universe formed in pairs.

Physics

Capping the length of extra dimensions

The existence of a small, elderly black hole places a new upper limit on the length of any extra dimension, a new study suggests.

Astronomy

The Star That Ate a Mars

COVER STORY: Scientists probe debris trapped by white dwarfs to learn more about what faraway Earthlike planets are made of.

Planetary Science

Losing Louisiana

A new model predicts that rises in sea level, combined with subsiding lands, will claim a tenth of the state by century’s end.

Space

Baby Milky Way modeled

Researchers unveil state-of-the-art simulation of galaxy formation.

Astronomy

Saturn’s moon may host an ocean

Geysers on Saturn's moon Enceladus could have delivered sodium from its underground ocean and into the planet's E ring

Space

Iron-ic twist deepens cosmic ray puzzle

Researchers announce an intriguing new finding about the most energetic charged particles in the universe.

Astronomy

Supernova may be in a new class

A recently discovered stellar explosion may be part of a new class of supernova.

Tech

Proposed quantum motor runs with a kick

Scientists suggest a way to put ultracold atoms to work.

Space

Alien visitor from afar

A speedy stellar neighbor may be a refugee from another galaxy.

Space

Betelgeuse shrinks

A familiar star, visible to the naked eye, has shrunk dramatically in just 15 years.