…that enormous zone 100 kilometres above earth, without air, light or sound, is so big that we measure its distance in the time it takes light to travel in a year. (A light year is roughly 9 trillion kilometres!)
Although it’s a vacuum, space is filled with dust and debris, gas, solar winds and cosmic rays, comets, asteroids, dark matter and energy, stars, planets, black holes and other galaxies. It’s a place of wonder and imagination. It’s a place of mystery and tremendous possibility.