A team of researchers believes these mysterious masses might be the buried remains of a lost planet ... picture of how cosmic collisions shape planets. As we continue to probe Earth’s interior ...

There are a lot of satellites, and a lot of trash, around our planet — and the quantities ... Considering how quickly things in Earth orbit tend to zip around, a fragment of a spacecraft ...

Planet Nine, also called Planet X, has never been caught on a telescope (Picture: Getty Images/Science ... planet seven times the mass of Earth tucked just behind Pluto. Despite possibly being ...

astronomers Konstantin Batygin and Mike Brown in January 2016 announced research that provided evidence for a planet about 1.5 times the size of Earth in the outer solar system. However ...

If it exists, Planet Nine orbits the Sun at an average distance around 550 astronomical units (AU), or 550 times as far as Earth is from ... into a single consistent picture.

And second, Mars doesn’t have a global magnetic field that concentrates auroras near its poles like Earth does ... auroras can appear all over the planet, but they’re relatively dim.

A new study modeled the chemistry of TOI-270 d, an exoplanet between Earth and Neptune in size, finding evidence that it could be a giant rocky planet shrouded ... more complete picture of the ...

Different regions of Earth’s orbit have their own levels of congestion and risk. Low-Earth orbit, which extends to around 1,200 miles (2,000 kilometers ) above the planet’s surface ...

Only in this case the planet, seen anew, is Earth. A picture caption with an earlier version of this review misstated how far away the astronaut William Anders was when he took a photograph of ...