The mysterious rock that flew past Earth could actually have been an alien spacecraft sailing past us using light, according to a new paper.
When Oumuamua flew past Earth, scientists rushed to learn about it: it was the first known object ever to have made it into our solar system from another. But as they scrambled to research it, the rock made its way out of the other side of our solar system, giving researchers only a glimpse to make the most of.
In that short time, astronomers established that the object was moving strangely. It was spinning very quickly as it flew through the solar system, and seemed to speed up rather than slow down as it went. Read more