|C/2019 Q4 (Borisov)|
Late last month, Russian amateur astronomer Gennady Borisov spotted a comet that appears to be visiting from very far away. The odd trajectory and tremendous speed of the object, known as Comet C/2019 Q4 (Borisov), strongly suggest that it was born around another star rather than our own sun, scientists say.
This comet is the third potential interstellar visitor we know about — and all of them were spotted in just the past two years. Is this then a possible alien invasion force?