Since it was not all light, the Universe must be expanding.

You may have heard the idea that the universe is expanding.

Three out of four haven't heard that the universe is expanding.

The universe has expanded to four or five times the size it had in our day.

Its energy could change the rate at which the universe expands.

If a universe expanded too quickly, it would become almost empty.

He had, in short, discovered that the universe is expanding.

This work helped to establish that the universe is expanding.

All information about whether the universe was contracting or expanding had been lost.

Our universe expands by a billion miles in all directions every hour.