Asked by Jaziya | 27th May, 2009, 12:09: PM

Expert Answer:

As the light from stars travels through the many layers of the Earth's atmosphere, it is bent (refracted) many times and in random directions (light is bent when it hits a change in density - like a pocket of cold air or hot air). This random refraction results in the star winking out (it looks as though the star moves a bit, and our eye interprets this as twinkling).

Answered by  | 27th May, 2009, 03:57: PM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.