He tweeted on Monday: “Today’s decay plot for the Tianhe objects.
“The core stage apogee continue to come down slowly.
“No new data today on Tianhe itself, which could indicate it made an orbit raising burn and tracking has lost it for now.”
In another tweet, the astronomer said the rocket is “bigger than anything recent” but larger man-made objects have crashed into our planet in the past.
However, he told SpaceNews: “I think by current standards it’s unacceptable to let it reenter uncontrolled.”