Mysteries of The Oort Cloud

Oort Cloud


The coldest, darkest reaches of our Solar System – a region still to be visited by human spacecraft – is a strange, frigid cloud that contains material from other stars and an unconfirmed object known as Planet Nine that may actually be a planet-mass black hole. This forbidding uncharted region, an enormous bubble of material encasing the planets and our Sun, is known as the Oort Cloud. This far-away shell surrounding our Solar System underscores Edwin Hubble’s observation in 1936 that “with increasing distance, our knowledge fades, and fades rapidly. Eventually, we reach the dim boundary—the utmost limits of our telescopes. There, we measure shadows.”