The brightness of a star can change with time. When observing from earth, the flickering of stars is due to minor turbulence in the earth's atmosphere. But when measured more accurately, many stars show a degree of variability in their brightness. There are many different types of variable stars.
The two main types of variable stars are,
1. Intrinsic variable stars
2. Extrinsic variable stars.
Intrinsic variable stars change their brightness due to changes in the properties of that star, while the mechanism of an extrinsic variable star involves an object outside the star.
If you are confident about your knowledge in variable stars, try this Variable star Quiz.
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