How often do you take a moment to look up at the night sky and gaze in awe at all its twinkly delights?
Of course, in the middle of London, light pollution can hide much of the detail, but in locations away from the city centre, once your eyes have had a chance to adjust to the evening darkness, the sky will soon come alive with an abundance of stars and planets, making you feel very, very small indeed.
Ever since humans could start making sense of things, we've been asking, "Are we alone in this universe?"
The Alien Invasion exhibition at the Royal Observatory in Greenwich explores this question as well as others like "If aliens do exist, would they be friendly or hostile?" and "Have they actually already visited our planet?"
Alien Invasion looks at how our views and beliefs about extraterrestrial life have changed over the last 500 years, from the writings and thoughts of the 16th-century astronomer Nicolaus Copernicus to today's scientists who believe they are closer than ever to being able to answer the question of whether life exists beyond our tiny blue planet.
The organisers of the Alien Revolution exhibition promise "scientific and fantastical images" that will captivate visitors and explore our ongoing obsession and fascination with other worlds.
Part of the Royal Observatory Greenwich's Alien Season, Alien Invasion is a free exhibition and runs from 1st March to 1st August.