Here’s an alternative explanation to the Planet 9 hypothesis, the idea that a large undiscovered planet in the outer solar system is pulling on some small outer worlds, distorting their orbits.

Astronomers are arguing over a brief and unusual flash in the night sky from earlier this year. The call it the Cow. One group argues it was a monster black hole shredding a passing star. The other argues it might have been a black hole being born.

A new study analyzes pulses of radio waves coming from a magnetar – a rotating, dense, dead star with a strong magnetic field – located near the supermassive black hole at the heart of the Milky Way.