With four planets in retrograde 2024 as winter solstice approaches, you don't need to be concerned. You simply need to be aware. Here's how.

It’s widely known as a gravitational slingshot, though most scientists refer to it as a gravitational assist, and it’s an ...

Are planets in the solar system that are closer to the Sun older than the ones further away? ... The inner planets, including Earth, took at least 100 million years, maybe more.

The inner planets are "probably rocky and may have thin atmospheres," NASA said, while the five outer planets are expected to have thick atmospheres. Artist's concept of Kepler-385, ...

These inner planets are now believed to be the youngest, taking at least 100 million years—and possibly more—to fully form. While a 90-million-year age gap might sound massive, ...

Southwest Research Institute has collaborated with Yale University to summarize the scientific community's notable progress ...

For decades it was thought that water was prevalent in the outer reaches of the Solar System early in its history, with comets and asteroids delivering moisture to Earth and the inner planets during ...

Our best simulations so far capture only the general picture of the inner planets' formation, a roughly 100 million-year-long period in which small planetesimals collided to form the planets we ...

Astronomers have gotten a sneak peek at what could be Earth's ultimate fate in about 5 billion years when the sun reaches the end of its life and engulfs the solar system's inner planets ...

Astronomers have discovered six planets orbiting a bright star in perfect resonance. The star system, 100 light-years from Earth, was described on Wednesday in a paper published in the journal ...

This planet will not be an inner planet, which would make April a more unpredictable time. The planet in question is Pluto, an outer planet that will station retrograde as of April 27.