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One of these regions would become what we now see as the observable universe.

There are probably more than 100 billion (10) galaxies in the observable universe.

Other strings could stretch all the way across the observable universe.

It is the largest and the most massive structure known in the observable universe.

There are probably over 170 billion (1.7x10) galaxies within distance we can see or the observable universe.

Quasars are found near the edge of the observable universe.

There are probably more than 170 billion (1.7 x 10) galaxies in the observable universe.

They are known to occur at great distances from earth, near the limits of the observable universe.

In the observable Universe there are roughly a hundred billion galaxies.

Back in the observable universe, however, Hawking's life is getting no easier.