There are a few possibilities for a fast-moving object in the sky that resembles a star heading north. Here are a couple of potential explanations:
Satellite: Many satellites orbit the Earth, and some of them are visible from the ground under certain conditions. Satellites reflect sunlight, making them appear like moving stars. There are various types of satellites, including those used for communication, weather monitoring, and scientific purposes. Some satellites are part of constellations, such as the Starlink satellites launched by SpaceX, which are known for their visible trains of closely spaced moving lights.
International Space Station (ISS): The ISS is the largest human-made object in space and is often visible from Earth. It moves relatively quickly across the sky, appearing like a bright, fast-moving star. Its trajectory can take it in different directions, including north, depending on your location and the time of observation.
Meteor or Space Debris: Occasionally, you may spot a bright and fast-moving object in the sky, which could be a meteor or space debris burning up in Earth's atmosphere. Meteors are often referred to as "shooting stars" and produce a brief streak of light as they vaporize due to friction with the atmosphere. Space debris, such as remnants of defunct satellites or spent rocket stages, can also produce similar visible effects.
To determine the exact nature of the object you saw, it would be helpful to provide additional details such as the date, time, and location of the observation. This information can assist in identifying known satellite passes, ISS sightings, or meteor events that may have occurred in your area around that time.