Residents report seeing the ball of flame – a meteorite – flashing westwards over the town on Monday night.
And others said they had witnessed it in Storrington and Billingshurst.
A number of people took to social media to report their sightings.
One described it as a ‘sizeable white/green ball of light’ and another described it as ‘amazing, with a bright green tail.’
A meteorite is a solid piece of space debris that survives its passage through the atmosphere to reach the surface of a planet.
When it enters the atmosphere gases cause it to heat up and radiate energy.
It then becomes a meteor and forms a fireball, also known as a shooting star or falling star.