Astronomers have picked up evidence of an Earth-sized world, distinct from the previously hypothesised Planet Nine and Planet X, that might be warping the orbits of objects beyond Neptune ...

If you’re feeling on the precipice of a great change: you’re right on time. On the 28th, Neptune—planet of idealism—forms a ...

Mercury, the smallest planet in the solar system, has spent billions of years quietly getting even smaller. Since its fiery ...

According to a new study by NASA, Earth is running out of oxygen, and they even know when it will occur. The study was led by ...

A Saturn-sized planet circling a tiny red dwarf is rewriting what scientists thought was possible in planetary systems.

If an extraterrestrial intelligence were looking for signs of human communications, when and where should they look? In a new ...

Enough fooling around. You’d like to see something amazing. A celestial spectacle that doesn’t require a telescope or star chart.

According to new information on SkySafari 6 Pro, a program used to predict the placement of stars and planets, Thursday, Aug.

Smithsonian scientists strive to understand the natural world from plants to planets. We work to save endangered species and conserve biodiversity, explore the Earth’s geological past and present, and ...

A New Mexico State University astronomer has discovered a gap in planet sizes that could provide insights into planet formation and the universe's origins.

But it’s not just looks. Rocky composition, general size, orbital behaviors—a lot of those qualities can be the same on both ...

A new theory suggests that “time” might be the product of a universe that, long ago, decided to settle down into one definitive story, sparking reality as we know it.