During the time the Koran was revealed people believed that shooting stars (meteorites) were actual stars falling out of the sky.
We now know that a shooting star is in fact only a rock, which ignites into a bright flame when it enters the Earth's atmosphere.
Yet to primitive man this would not of been so obvious which is why they thought a shooting star was literally a star falling, hence the term shooting star.
The link below explains this myth:
When they saw a streak of light, they thought a star was falling out of the sky
http://www.britannica.com/bps/additionalcontent/18/32823433/Shooting-Stars
Does the Koran repeat this myth too?
What are stars created for:
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YUSUFALI: We have indeed decked the lower heaven with beauty (in) the stars,- (For beauty) and for guard against all obstinate rebellious evil spirits,
According to the Koran stars are created for their beauty and as a guard against evil spirits.
But how are they used to guard the heavens?
YUSUFALI: And we have, (from of old), adorned the lowest heaven with Lamps, and We have made such (Lamps) (as) missiles to drive away the Evil Ones, and have prepared for them the Penalty of the Blazing Fire
According to the Koran stars are shot as missiles at thie evil spirits. Clearly the author of the Koran is reinforcing the myth of the shooting star.
This is confirmed by Bukhari:
The lowest heaven has lamps [stars], and ‘We have made such (Lamps) (as) missiles to drive away the Evil ones, and have prepared for them the Penalty of the Blazing Fire.’" Sura 67:5
"The creation of these stars is for three purposes, i.e. as decoration of the sky, as missiles to hit the devils, and as signs to guide travellers. So, if anybody tries to find a different interpretation, he is mistaken and just wastes his efforts..." Bukhari vol.4 book 54 ch.3
Shihab the word used by the Koran to describe the shooting star is an ancient Arabic word used even in the time before Islam. It was used to literally
describe a star falling from the sky in accordance with the myth.