At home, unable to sleep, skywatching out the bedroom window. unable to miss, bright blue-green light about one mile away. immediately thought it was a shooting star until i realised it ascended out of the atmosphere, opposed to descended towards earth. caused a feeling of anxiety. the round-shaped object was floating for around 5-10 seconds, before darting from north to north-east (leaving a light-coloured trail) before ascending out of our atmosphere!