A new explanation for the solar system's radioactive elements suggests Earth-like planets might be found orbiting up to 50 ...

The comet is the third object ever confirmed to have entered our cosmic neighborhood from elsewhere in the galaxy. Space ...

Before 3I/ATLAS, the only other confirmed interstellar tourists we've seen were the now-famous, cigar-shaped 'Oumuamua' in ...

Rocky planets like our Earth may be far more common than previously thought, according to new research published in the ...

The interstellar comet 3I/ATLAS will reach its closest point to Earth on December 19, giving astronomers a closer look at the ...

This interstellar vagabond is only the third large interstellar visitor that we have ever discovered — an asteroid or comet ...

Comet 3I/ATLAS will get closest to Earth on Dec. 19, and astronomers will be watching.

Our solar system is a passenger on a galactic rollercoaster. Part 2 reveals how the Sun, carrying Earth, orbits the Milky Way's core at 491,000 mph, completing a circuit every 230 million years. We ...

A spiral galaxy, shaped much like our Milky Way, has been found in an era when astronomers believed such well-formed galaxies ...

The filament of matter stretches 50 million light-years, and contains a row of galaxies 5.5 million light-years long that are ...

While the 21st century has been bumpy, it has also ushered in monumental scientific and technological breakthroughs that have ...

The interstellar comet 3I/ATLAS is making its closest approach to Earth on Dec. 19. Learn about the 'reconnaissance mission' ...