James O'Donoghue went viral for the first time in December 2018. He was a planetary scientist for NASA at the time, but the federal government had temporarily shut down due to budget disputes in ...

A new study suggests that a close encounter with a massive interstellar object, possibly eight times the mass of Jupiter, may have significantly altered the orbits of the four outer planets in our ...

In 2009, a pair of astronomers at the Paris Observatory announced a startling discovery. After building a detailed computational model of our solar system, they ran thousands of numerical simulations, ...