Forty-three years ago, in March 1982, humanity received its last direct visual postcard from the surface of Venus.

Mercury is tiny, barely bigger than the Moon. Its metallic core makes up 70% of the planet’s mass, vastly exceeding Earth’s ...

October's longer nights bring two transits of Titan across Saturn, while Io and Europa tango together across Jupiter three ...

We could be overlooking an entire population of asteroids that pose a threat to Earth on the very simple basis that they're ...

Venus is often called Earth's "sister planet" because of their similarities in size, mass, and composition. Both are rocky ...

From a distance, Biosphere 2 emerges from the cacti and creosote of the Sonoran desert like a gleaming oasis, a colony of ...

Scientists have proposed a new explanation for Venus' giant, crown-shaped geological features, known as coronae.

In Earth’s early days, more than 4 billion years ago, the surface was a dangerous and unpredictable place. Violent volcanoes, ...

Hidden barrier found 400 miles inside Venus that blocks rising hot rock and creates ring-shaped volcanic features called ...

A new study warns of an undiscovered population of asteroids that could strike Earth with little to no warning.

The month is packed with skywatching highlights—including two galaxies visible to the naked eye and a rare glimpse of the ...

Utah State University's Space Dynamics Laboratory has released open-source software to detect potentially harmful shooting ...