Reggie Watts, the programme’s bandleader, asked Obama whether he had any theories or information about UFOs.
Astronomers had long been searching for comet-like objects entering the Solar System from the vastness of interstellar space, but had never before observed one.
Miley Cyrus claims she has had an encounter with aliens. However, the 27-year-old singer admits she was high at the time, so cannot be certain of what she saw.
Scientists have used probes and telescopes to seek "biosignatures" - indirect signs of life - on other planets and moons in our solar system and beyond.
"My guess is that some alien, cheeky and terrible teenagers left home with their parents' UFO and started planting metal monoliths around the world."
A video of a strange creature has spread like wildfire in India, causing panic among residents and social media users. The strange creature in the video looked like an alien, or a ghost wandering in the streets of the Indian state of Jharkhand.