On 8/03/2020 at about 19:55 i went outside on the balcony for a smoke, i heard a plane go by as the airport is nearby and looked up, i saw the flashing lights of the plane as he was still ascending and at about 15 - 20 000ft i could still hear his sound, something caught my eye to the right and i saw a light which looked like a normal star in the night sky except this one was moving, then i saw a second light and a third...... all in all seven lights precisely evenly spaced from another travelling from west to east in a perfectly straight line, no blinking lights and no sound, i could only hear the plane which at this stage passed underneath them, took about a minute for them to disappear behind our building's roof. i could tell that they were very high up, much higher than the plane....Looked like stars but moved evenly and fast