If they're in place, then the black hole doesn't form.

Black holes could form a useful means of travel into the future.

However, it is very unlikely that white holes can form for a long amount of time.

We knew how black holes formed and what their neighborhoods were like.

With time and repeated use, small holes can form in the rubber.

You know that a black hole may form from the collapse of a massive star?

The hole formed did not fill in when he pulled the finger out.

But there's no other way a black hole can form, now.

There was a time when black holes of all sizes could form.

Together these holes form a circle approximately 38 feet in diameter.