Europe's ExoMars 2016 mission arrived at the Red Planet, the case for the putative Planet Nine got even stronger and Chinese astronauts docked with the nation's space lab. Here are the most amazing things that happened in the universe this week.

ExoMars arrives at the Red Planet

Europe succeeded in placing a methane-sniffing spacecraft in orbit around Mars on Wednesday (Oct. 19), but it wasn't immediately clear whether or not that probe's piggyback lander made it safely to the planet's surface

ExoMars lander's crash site found

Europe's ExoMars lander apparently crashed on the Red Planet, and an orbiting NASA spacecraft has spotted its grave, European Space Agency officials said

More evidence for Planet Nine — solar system's odd tilt

The putative "Planet Nine" may have tilted the entire solar system, researchers say. [Full Story: Did the Mysterious 'Planet Nine' Tilt the Solar System?] 

Planet Nine may be found next year

The giant planet thought to be lurking unseen in the dark depths of the outer solar system may not stay hidden for much longer. [Full Story: 'Planet Nine' Can't Hide Much Longer, Scientists Say] 

SpaceX concerned about potential sabotage

Statements attributed to SpaceX founder Elon Musk suggest he remains concerned that Falcon 9 rocket operations are vulnerable to attack by "a long list" of SpaceX adversaries even if it's unlikely that such an event was behind the Sept. 1 explosion. [Full Story: SpaceX's Musk Says Sabotage Unlikely Cause of Sept. 1 Explosion, But Still a Worry] 

Chinese astronauts rendezvous with Tiangong-2

A Chinese spacecraft carrying two astronauts has successfully docked with the uncrewed Tiangong-2 space lab, according to Chinese media reports. [Full Story: Chinese Astronauts Dock with Tiangong-2 Space Lab] 

Three astronauts launch toward International Space Station

A Russian Soyuz rocket launched an American astronaut and two Russian cosmonauts into orbit Wednesday morning (Oct. 19), beginning a two-day journey to the International Space Station