> The core booster from the Long March 5B rocket that launched Tianhe-1 ended up in an uncontrolled orbit around Earth.
> It is expected to fall back to Earth this weekend, with current estimates suggesting it will begin reentry between 2:13 p.m. Eastern Time Saturday and 8:13 a.m. Sunday. That’s such an enormous window that no one has any idea where it will land.
> At 21 metric tons and 10 stories tall, the booster, CZ-5B, is huge.
