Which one of the following statements is not correct ........

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Which one of the following statements is not correct?

Event Horizon is the central part of the black hole which has gravitational acceleration so strong.

The Big Bang theory is the prevailing cosmological description of the development of the Universe. ?

The colour of stars indicates it's temperature.

Universe is a group of infinite glaxies and each glaxy contains billions of stars.

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Explanation:

A black hole is a region of spacetime exhibiting gravitational acceleration so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole. The boundary of the region from which no escape is possible is called the event horizon. Although the event horizon has an enormous effect on the fate and circumstances of an object crossing it, no locally detectable features appear to be observed.