Professor Avi Loeb, a theoretical physicist and cosmologist from Harvard University, told MailOnline why he thinks a new ...

In 2017, astronomers made an unprecedented discovery: the first interstellar object ever confirmed to visit our solar system—1I/2017 U1, also known as Oumuamua. This mysterious object, unlike anything ...

British astronomers may have solved the mystery of an "interstellar object" hurtling towards our planet. Scientists believe the mysterious interstellar visitor may be the oldest comet ever observed.

A newly discovered object from deep space may be the oldest comet ever observed—possibly more than 7 billion years old, and ...

I/Atlas was first spotted on July 1 by the Asteroid Terrestrial-impact Last Alert System (Atlas) survey telescope in Río ...