We can’t observer how the universe formed, but scientists are still willing to say that we know the universe was created through a Big Bang. In this scenario, students will learn the three main lines of evidence for the Big Bang: the universe is expanding, the Cosmic Microwave Radiation, and the mixture of chemical elements.
This community is part of the ISE hangouts series devoted to Astronomy and Space Science. Each community has an associated hangout where Dr. Pamela Gay, renowed astronomer and educator interviews scientists involved in research related to the topic being addressed by the hangout. You can find the hangout here: