Astronauts successfully depart the ISS aboard SpaceX Dragon, starting their trip home

NASA astronauts Bob Behnken and Doug Hurley have successfully undocked from the International Space Station, which is the first crucial stage of their return to Earth. Next, they'll travel on a coast phase that will take them on a descent course back through the atmosphere from space, shedding speed as they prepare to deploy the parachutes of the SpaceX Crew Dragon spacecraft and drop into the Atlantic Ocean for recovery.

The undocking, coast and splashdown phase are all meant to be performed entirely via automation, with the control systems SpaceX designed for Crew Dragon managing the entire process, including burns to control the capsule's travel away from the Station and its controlled descent through the atmosphere. While re-entering the atmosphere, the Dragon will undergo tremendous stress, and its angle of descent is intended to slow its velocity to the point where it can safely deploy those parachutes to slow its fall even further, all the while keeping Behnken and Hurley safe.

The coast phase will take many hours, with SpaceX and NASA expecting the eventual splashdown of the capsule happening sometime around 2:42 PM EDT (11:42 PM PDT) tomorrow, Sunday August 2.

SpaceX makes history with successful first human space launch

This is the final phase of SpaceX's Demo-2 mission from its Commercial Crew program with NASA, which is the qualification program that the agency requires to certify Crew Dragon for regular operational missions taking astronauts to and from the station. Behnken and Hurley launched on the first part of this historic mission, which is the first to see humans fly aboard a SpaceX spacecraft, on May 30, and have spent the intervening months on the Space Station contributing to regular crew missions.

Crew Dragon will splash down off the coast of Florida to conclude Demo-2, and SpaceX crews are on hand to recover the astronauts at that point and bring them the rest of the way back to terra firma. If everything goes to plan, then SpaceX will officially be ready to begin standard astronaut flights, as mentioned - and the first of those is planned for sometime in late September, so they won't have to wait long.

We'll have updates for the remainder of this final leg as they become available, so stay tuned.