Ganymede, Jupiter's largest moon and the solar system's largest, is bigger than Mercury and the dwarf planet Pluto, with a diameter of 5,268 kilometers.

So in some sense, alien worlds were not first discovered in the 1990s or even the 1980s. It took nearly a century to fully ...

Scientists from NASA have developed a new equation that may help assess the chances of life existing on this planet. Could ...

To save ourselves from a killer asteroid, first we have to find it. A spacecraft now under construction at NASA’s Jet Propulsion Laboratory in may be our best hope. The Near-Earth Object Surveyor is a ...

The two exoplanets, or planets outside of our solar system, orbit a star called TOI-1453, which is slightly cooler and ...

Back in 1969, when Neil Armstrong and Buzz Aldrin first set foot on the moon, scientists knew of just 31 other moons in our ...

For now, it looks like NASA’s orange behemoth has a little life left in it. All the hardware for the Artemis II mission has ...

The findings provide strong evidence that four giant exoplanets 130 light-years from Earth formed much like Jupiter and ...

Astronomers have examined infant planets orbiting a star 370 light-years away, seeing the exomoon forming disks of gas and ...

Even though Venus moves between the Earth and sun every 19.5 months, it becomes visible after sunset and before sunrise only ...