How many things can you see in the sky?a lot!On a clear night tou might see the Moon and thousand of sparkling stars.You might see that some stars that look white are really red or blue.But scientist believe there are some things in sky that we will never see.We won't see them with the biggest telescope in the world,on the clearst night of the year.That is because they are invisible. the mysterious dead stars called black holes.Imagine if the earth were crushed until it was the size of a tiny marble.That is how tightly a dead star,black mhole ,is packed what pulls the star in toward its center with such power ? it is the same force that pulls you down when you jump -the force called gravity.A black hole is so tightly packed that its gravity sucks in everything-even light .The light from a black hole can never come back to your eyes.That is why you see nothing but blackness.So next time tou look at sky remember:there is more in the sky than that meets the eye!scattered in the silent darkness are black holes-the great mystery of space...
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