What are the mysterious SUV-size drones spotted flying over New Jersey? All the theories explained

More from Science & Technology

• Movie fans spot disturbing detail about Interstellar amid film's re-release

• Scientists warn of impending volcanic eruption that humanity is not prepared for

• World's fastest object completes NASA sun mission as historic 'as Apollo moon landing'

• Top psychiatrist reveals key signs you have narcissistic parents... and how to deal with them

• Psychologists reveal how to spot a manipulator in just seconds

• Urgent warning in 29 states after canned beverage is recalled over potentially deadly bacteria contamination

• Scientists pinpoint just how fast Santa would have to travel to visit every child on the planet... and reveal why, at this speed, Rudolf's nose wouldn't be red

• Vatican to open sacred portals starting Christmas Eve to save Catholics from eternal damnation

• Incredible optical illusion tricks your brain into seeing a green Christmas tree - here's how it works

• Scientists reveal the shocking reason why designer cats made popular by celebrities from Taylor Swift to Molly-Mae Hague could be BANNED

• Revealed: The correct temperature to set your fridge this Christmas to help prevent food poisoning

• Social media firms could be made to use facial recognition technology to check children's ages

• Mystery of Peru's' 'alien mummies' deepens after two more corpses are found with slanted eyes and hair

• America's spies hold a Christmas ornament competition every year... and some have a 'cloak and dagger' theme

• Shocking video shows how the 'Cave of Death' kills everything that ventures inside

• CIA docs claim life did exist on Mars... and it was a population of 'very large people' who built pyramids

• NASA probe enters 'uncharted territory' to become closest human-made object to the sun on Christmas Eve

• New forecast map predicts only 18 US states will have a white Christmas

• Ruins of ancient palace found at site where Biblical prophet wrestled with God

• Urgent recall for smartphone accessory sold on Amazon due to fire and burn hazards