The simulation of the Solar System that came the closest to the observation was the presence of a small planet, between the ...

Join me as I take my kindergarten students on a fun and interactive classroom spacewalk! We explore the solar system, meet ...

A low-density, puffy planet orbiting relatively far from a young star in a nearly perpendicular orbit. What's going on?

A new study has proposed the existence of Planet Y, an alternative Planet Nine candidate that is smaller and closer to Earth ...