Research suggests that an ancient shoreline helped to sculpt the drop between Mars' southern and northern hemispheres.

A polar vortex dipping down from Siberia is bringing a cold front with frigid temperatures to millions Americans. See maps of ...

The first dinosaurs may have evolved near the equator, and not in the southwest of the supercontinent Gondwana, as ...

Trump suggests renaming the Gulf of Mexico to the Gulf of America. So, can he do that? Here's what goes into a name.

President Donald Trump said in his inaugural address that he will change the name of the Gulf of Mexico to the “Gulf of America,” repeating an idea he first brought up earlier this month during a news ...

Measuring distances across the universe is much more challenging than measuring distances on Earth. Is a brighter star closer ...

Keeli Marvel's usual holiday traditions include the one where she walks the sidewalks, the fields, the streams and the ...

Many other Caldwell objects lurk in the southern sky. I’ll return to them in future columns when they climb higher in the evening sky. This map portrays the sky as seen near 30° south latitude.

Summer nights mean late sunsets and lingering twilight, hardly a recipe for great night-sky observing. But this January exceeds expectations with fine views of four bright planets. Venus punches ...