Guiding Questions

• Has the universe always expanded as it does today, or might it have suddenly “inflated”?

• How did the fundamental forces of nature and the properties of empty space change during the first second after the Big Bang?

• What is antimatter? How can it be created, and how is it destroyed?

• Why is antimatter so rare today?

• What materials in today’s universe are remnants of nuclear reactions in the hot early universe?

• How did the first galaxies form?

• Are scientists close to developing an all-encompassing “theory of everything”?