When Earth is opposite Mars from the sun, it will appear full because you’re looking directly on the daylit side. But ...

The entire progression will be observed by the ESA’s orbiters the Mars Express and ExoMars Trace Gas Orbiter as well as ...

Venus is often called Earth's evil twin due to its size, mass, material composition, and density. It even feels like Venus should've become a second Earth. However, it ended up being one of the ...

Interstellar comet 3I/ATLAS has caught the interest of astronomers and amateur enthusiasts alike as just the third object to ...

Analysis by researchers at the University of Bern suggests that water and other volatile compounds arrived on Earth from outer space—specifically via a collision with a Mars-sized planet billions of ...

When it comes to the question of which planet humanity could one day call home, the obvious choice might seem to be Mars. But surprisingly, Venus might actually be a better candidate for human ...

A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...

Another, even rarer view is to see our planet from the surface of another world—something, in fact, that first occurred only in 2004, when NASA’s Spirit rover on Mars snapped an image of Earth in that ...