- What does it mean that the Universe started from a tiny, hot point? How can something come from “almost nothing”?
- Was there anything before the Big Bang? If so, what might it have been?
- Why did the Universe suddenly begin to expand so quickly? What could have caused it?
- How do scientists figure out what happened billions of years ago without anyone watching?
- What is the cosmic microwave background, and why is it important?
- Could the Universe be one of many? What might other universes be like?
- How does the idea of an expanding Universe change how we understand space and time?
Hubble Telescope
This powerful space telescope helped confirm that the Universe is expanding by observing distant galaxies moving away from us — key evidence for the Big Bang Theory.
Cosmic Microwave Background (CMB)
The leftover heat radiation from the early Universe, detected by scientists in the 1960s, gives us a snapshot of what the Universe looked like shortly after the Big Bang.
Edwin Hubble and the Expanding Universe
Hubble’s observations in the 1920s showed that galaxies are moving away from each other, proving the Universe is growing — a foundational idea behind the Big Bang.
Gravity
Gravity is the force that pulled matter together after the Big Bang, helping atoms clump into the first structures in the Universe.
Light and Electromagnetic Spectrum
Studying different kinds of light from stars and galaxies helps scientists learn about the Universe’s age, composition, and history.
The Scale of the Universe
Understanding just how vast the Universe is helps us grasp the incredible journey from the Big Bang to where we are today.
Dark Matter
Most of the Universe is made of invisible matter called dark matter. We can’t see it, but it affects how galaxies move and hold together.
Collective Learning and Science
The Big Bang Theory is built on generations of discoveries, showing how humans learn about things no one can directly observe.