The formation of Mercury remains an unsolved mystery. The planet closest to the sun has a disproportionately large metallic core—accounting for about 70% of its mass—and a relatively small rocky ...

On May 21, 2010, the Akatsuki orbiter ("Dawn" in Japanese) launched from the Tanegashima Space Center atop a H-IIA Launch ...

It has been suggested that lava tubes - underground tunnels carved out by molten rock - might be on Venus, and now we have ...

Fifteen years after launch, JAXA has said goodbye to the spacecraft, our only working probe around Earth's "sister planet".

If you want to build a little rocket to get off a little planet, [Rocket Lab is] probably a good place to start,' ...

There are endless ways to die down here on Earth, but if you did your dying up on Venus, your experience of death would be ...

Earth is the only planet in our solar system with a single moon, making it a rare phenomenon for a planet of its kind.

Saturn will put on a show for professional and backyard astromers alike, and be the brightest and closest it has been to ...

A new moon is when the moon shares the same celestial longitude as the sun; the two bodies are said to be in conjunction.

Summer is officially over September 22, at 2:19 p.m. Time to hang up the surfboard, deflate the beach balls, stow the grill, put away the Hawaiian shirts, and have a good cry. Naturally you're angry.

The transition into fall means Halloween is right around the corner, which also means you have the perfect excuse to host a ...

On Sept. 20, Venus will clash with rebellious Uranus, the planet of chaos, breakthroughs and unexpected change. Sparks will ...