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We've known for a long time that the universe is expanding. But about 15 years ago, my colleagues and I discovered that it is expanding faster and faster. That is, the universe is accelerating, and that was not expected, but it is now attributed to this mysterious stuff called dark energy which seems to make up about 70 percent of the universe.

Observations indicate that the universe is expanding at an ever increasing rate. It will expand forever, getting emptier and darker.

Cosmology is a rapidly advancing field.

And what we know, or think we know, about the universe of space and time is changing very quickly.

Einstein wrestled with a problem back before we even knew the universe was expanding, and he was looking for a way to keep the universe from collapsing. And so he discovered, in his theory of gravity, something like this dark energy - he called it a cosmological constant - could play this role, pushing things away.

When we see what the universe has to show us, we can go no further.

For almost a century, the Universe has been known to be expanding as a consequence of the Big Bang about 14 billion years ago. However, the discovery that this expansion is accelerating is astounding. If the expansion will continue to speed up, the Universe will end in ice.

There comes a point in your life when you realize how quickly time goes by, and how quickly it has gone. Then it really speeds up exponentially. With that, I think you start to put a lot of things into context; you start to see how huge the world is, and really, the universe.

The missing link in cosmology is the nature of dark matter and dark energy.

The universe is more than mere matter in motion. It and we were brought into being by a Creator who seeks our good.