This November an asteroid known as 2015 TB145 is set to zip past Earth again. The 2000-ft diameter rock, which in certain light conditions bears a remarkable resemblance to a human skull, was first spotted flying by the planet in 2015 on Halloween. At that time, the asteroid missed Earth by about 300,000 miles. The 'Death Comet' as some have called it is thought to be an extinct comet stripped of its ice by numerous close encounters with the sun.