Natural Phenomena:
* Starlink Satellites: The most likely explanation is a chain of Starlink satellites launched by SpaceX. These satellites are designed to provide internet access and appear as a string of bright lights moving across the sky. They are often visible in the twilight hours and can be seen in a line or a train-like formation.
* Meteor Shower: While unlikely to be 15 lights perfectly in a row, a meteor shower could result in multiple meteors appearing in relatively close proximity.
* Aurora Borealis (Northern Lights): While typically seen in higher latitudes, the Aurora Borealis can sometimes be visible further south. It's possible to see lines of light from this phenomenon, but not usually in a perfectly straight line.
Man-made Phenomena:
* Aircraft: A string of aircraft flying in formation could appear as a line of lights. This is more likely to be seen near airports or military airbases.
* Searchlights: Large events or concerts sometimes use multiple searchlights which, depending on distance and your perspective, could appear as a line of lights in the sky.
Unidentified Phenomenon:
* UFOs: While this is a popular theory, it's important to note that there is no concrete evidence of UFOs. Any sightings should be investigated with a critical and scientific approach.
To determine the cause, consider these factors:
* Time of Day: Starlink satellites are often visible in the evening or early morning. Meteor showers have specific dates and times.
* Location: Some phenomena are more common in certain regions, such as auroras in the north.
* Movement: Are the lights moving slowly or quickly? In a straight line or a curved path?
* Color: Do the lights have any particular color?
* Duration: How long did the lights remain visible?
Resources for Identifying Objects in the Sky:
* Stargazing Apps: Apps like Stellarium or SkySafari can help identify stars, planets, and other celestial objects.
* Satellite Tracking Websites: Websites like Heavens-Above or Find Starlink can track satellite paths.
* Local Astronomy Clubs: They often host events and provide resources for identifying objects in the sky.
By gathering more information and using available resources, you can likely identify the source of the 15 lights in the sky.