Today, it’s believed that Jupiter and Saturn, the largest planets, were the first to fully form, both within a few million ...

Curious Kids is a series for children of all ages. If you have a question you'd like an expert to answer, send it to ...

Scientists have discovered a new way to uncover what lies beneath the surfaces of planets like Mars by studying the debris ...

The moon's nearside (that is, the side facing Earth) is dark-colored and dominated by ancient lava flows, whereas the farside ...

It isn’t easy to figure out how the Earth was built, because it happened 4½ billion years ago, and no one was there to watch. So scientists have had to look at what the Earth looks like now and at all ...

What if billions of years ago, the Red Planet had rain, snow, and even rivers that carved out landscapes much like those we ...

NASA's Perseverance rover has observed an aurora on Mars in visible light for the first time, with the sky glowing softly in ...

WD 1856+534b—a freezing world with a surface temperature of -125 degrees Fahrenheit—exists where planets are normally scoured ...

Mercury may be the closest planet to the Sun, but it's long been overshadowed in scientific exploration. With only two missions ever reaching it - most recently NASA's MESSENGER - the planet remained ...

Mercury will square Pluto retrograde, creating tension between your beliefs and how you communicate them. While Mercury ...

What is the hottest planet in the solar system? If you want to know which is the hottest star in the solar system, this ...

While Mercury is often associated with havoc-wreaking retrogrades, the messenger planet deserves more credit for coloring our ...