Navigation colors are designed to be distinctive
Aircraft normally carry red and green navigation lights on opposite sides plus white strobes or tail lighting. At sufficient distance these can blend or alternate as the viewing angle changes, creating a striking multicolor point.
Atmospheric scintillation can imitate colors
A bright star low on the horizon can rapidly flash red, green, blue and white as turbulence bends different wavelengths through the atmosphere. Unlike an aircraft, its position remains fixed relative to neighboring stars over short periods.
Movement breaks the tie
If the colored light steadily changes position, aircraft becomes much more likely. If it remains fixed for many minutes, a star or planet becomes more plausible. A head-on aircraft is the important exception because it can appear fixed temporarily.
Use live aircraft evidence when the timing allows
For a current sighting, Sky Event Radar checks nearby ADS-B traffic and reports distance, bearing and altitude. For an older sighting it refuses to use current aircraft positions and leaves that evidence explicitly unknown.
Verify it with data
Use the Sky Event Radar checker with the actual location and time. The result can compare the observation pattern with modeled weather, current aircraft when applicable, NASA/JPL large-fireball records, NOAA aurora context, launch timing and local sky geometry. Missing feeds remain explicitly unknown.
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