The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

NASA’s Hubble Space Telescope captured a cameo appearance of the tiny moon Phobos on its trek around the Red Planet. This composite image, from NASA Galileo and Mars Global Survey orbiters, of Earth ...

As the planets align in relative proximity to one another in our field of view, they offer researchers unique conditions to study their interactions and behavior within the solar system.