At the ragged frontier where the Sun’s influence gives way to the galaxy, a decades‑old spacecraft has stumbled into a ...

Some researchers suggest a different force shaped these orbits long ago—a wandering planet, one to two times Earth’s mass, that may have passed through the outer solar system in its early days. 2.

While its star projector leaves a lot to be desired, the Science Can Solar System Planetary Projector is a fantastic educational tool for kids, with its solar system model, complete with talking ...