When NASA's Messenger probe finally entered orbit around Mercury, it discovered a world that is still geologically active.

ESA's Solar Orbiter captured views of the planet Mercury passing in front of the Sun. Multiple instruments aboard the ...

If you've never sighted this rocky little world for yourself, you'll never get a better opportunity than right now to see it.

Located about 39 light-years from Earth, the TRAPPIST system resembles a miniature version of our solar system: The star, an ...

A spaceman has captured jaw-dropping views of aurora from orbit. NASA astronaut Jonny Kim shared the scene from aboard the ...

The mini-satellite, named 3UCubed, was built over 5 years by students at Sonoma State, Howard and the University of New ...

The moniker cold moon indicates that it’s the full moon event closest to the winter solstice, the shortest day of the year in ...

Mercury is the innermost and smallest of the eight major planets in our Solar System, orbiting closest to the Sun. Though ...

Of the seven Earth-sized worlds orbiting the red dwarf star TRAPPIST-1, one planet in particular has attracted the attention of scientists. This planet orbits the star within the "Goldilocks zone"—a ...

December’s full moon isn’t the brightest, but clear Northern Nevada skies should still offer a strong view of it.

Mercury retrograde is an optical illusion that occurs when the planet Mercury appears to move backwards in the night sky.

Is it a full moon today? Here's when to watch and what to know about December cold supermoon 2025 meaning as it rises in ...